Bad-PDF create malicious PDF file to steal NTLM(NTLMv1/NTLMv2) Hashes from windows machines, it utilize vulnerability disclosed by checkpoint team to create the malicious PDF file. Bad-Pdf reads the NTLM hashes using Responder listener.
This method work on all PDF readers(Any version) most of the EDR/Endpoint solution fail to detect this attack.
Reference : https://research.checkpoint.com/ntlm-credentials-theft-via-pdf-files/
Adobe has released a security update(APSB18-09)to address this vulnerability and CVE-2018-4993 is assigned for this vulnerability.
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Responder/Kali Linux
Usage:
python badpdf.py
* Vendor patches are not available for this vulnerability
Adobe patch: https://helpx.adobe.com/security/products/acrobat/apsb18-09.html
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Microsoft issued an optional security enhancement [0] late last year that provides customers with the ability to disable NTLM SSO authentication as a method for public resources.
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Disable external SMB access in firewall to prevent NTLM hash leak to internet
https://github.com/InQuest/yara-rules/blob/master/NTLM_Credentials_Theft_via_PDF_Files.rule