Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac650db9a521b0d4…

MALICIOUS

PDF

68.0 KB Created: 2021-05-29 06:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e4579ae55898100ba15319dfcb9b127 SHA-1: 2f30956d003055dd50be9d20ee1379535e2b267d SHA-256: ac650db9a521b0d4e50feed3c07cc7304fe7fe86ff74dd297b4e829d6135404f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised websites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0faaaf6d---durerexewib.pdf
    • http://anthonyvienna.com/sites/default/files/file/29537788995.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0v30vljnrde3h0pi6ukd3gfqeb/tesitugezitudimubit.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab861a58878---92453255455.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/897796b6d04f1ab617bd7d958253ffc9/silogipafidugafivewaga.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8c0jcqgqb58skm7rqannk7mu18/85722795536.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d09ccb111329f2eece23d03d41bcf5b/kameladewawiwid.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fa6e5ff3f4cf92846b3595ffbc6b591e/46048621027.pdf
    • http://merwepizza.com/upload/file/devulutevu.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/3tt4argc4sart59qbrojc0n3d3/mapupiluxetukepuri.pdf
    • https://sjalikave.hu/pictures/file/69791063999.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5637219f981a069ed79af83e17513310/zuxederojenafewagalegafor.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860ea8a8a5---15683973775.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160918a26262e0---63830243648.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2cec72ad8---zakuviwazeriluwexosoj.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/tgtf6gpbh5occaqpq5renhvcar/84214192197.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bissell+proheat+pet+carpet+cleaner+manual
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7dd.bin
8a7b90c0e54895ea1e2e081a94ef0cfcde2f91a7f620dc718ecc5ac35c1507f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 5224 bytes
font_01_sfnt_off0000e973.bin
ea4a33f2d44ee9db4547279e455d1882e0fa00801421b72ef0f79fe56546b1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 10604 bytes

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