Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2d0c9167a9b950…

MALICIOUS

PDF

48.0 KB Created: 2021-07-07 10:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f7e33e7c9f4f97b3f3bd3d1f13be132 SHA-1: 014d91365ff548c229c9a9d87f28a55c359f9fc7 SHA-256: 6c2d0c9167a9b950448287a6c849ffdb46815c8df8a9ce775365922a9407bc7b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a phishing lure. It contains a large number of external links, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is often used to create image-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7126

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 48 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://nomylo.ru/uplcv?utm_term=how+to+find+the+nth+term+of+a+geometric+series
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd125bf2c86---30365281687.pdf
    • http://martom24.pl/martom/userfiles/file/lowisuvasizaraxajatowow.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdbeb0800e---purinexugevopa.pdf
    • https://tenfci.org/userfiles/file/dupusudabatuvudare.pdf
    • http://richfieldhighschool1969.com/clients/868116/File/73865931947.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a7602d74---fupudowazogovure.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/171ccd5f8019d35721c5ce341ad84acb/fazaxixodufigi.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/df5855e58484b07013d2378fe3332075/13626943562.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/70941869314.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/bgkipoch9hltmug2oqr2f2lq03/kiwurupa.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/7e4pv5at2953heeq4vgptso5un/58502514277.pdf
    • http://ji-tien.com/userfiles/file/sisupasugowakewulurax.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abe7408279d---logexuvawikosalikonifowe.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da71ce61580---43805682533.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3b457d7573d87a6f86289b3d9cd1b996/79451282170.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a28f0db3---27137681911.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8279312b---togoritese.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/go1uoageqvda8l0mbk1ljmacoo/vukizidazezolurogirogi.pdf
    • https://curewelldiabetes.com/userfiles/file/junerawevutodobufupava.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/49393698797.pdf
    • http://mcenterdk.ru/fck_editor_files/files/wejaximagizanijiwabi.pdf

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