Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d8f589eaf97b76…

MALICIOUS

PDF

54.5 KB Created: 2021-06-08 00:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 742e5738e2e705108703f5eeba293768 SHA-1: 164559fa48daac2d6228cc61f5358554441bfa37 SHA-256: 95d8f589eaf97b767e5ec8633d4696b902ef439d1a0d75f38a59c79d2a6f19e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination of the malicious payload. The embedded URLs and the PDF's structure suggest it's part of a phishing campaign, potentially using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6365

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://archism.ru/uplcv?utm_term=servidores+para+http+injector+movistar+2020+per%25C3%25BA
    • https://angkortaxiservice.com/userfiles/file/kipavuwudipop.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t6b91o50vnmhuno1vh10n7vkd6/96326714239.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec0b799e58---zuluj.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2bbf33405---kaxage.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/grt08528qsvf0v9sd4mmm40kvd/92504920756.pdf
    • http://thedreams.cz/files/66407421573.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/jptdcguk393cu0d7hfc39iocg7/wimorataxij.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8f45f513---bexojexegexuxesa.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ebfb0789ea3acb144a1700bfcf196135/96172766321.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/01st2kehs093p6c5acpkvvo6q5/17819746288.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098891bde56e.pdf
    • http://healthywithhart.com/res/file/13371025974.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753563d3406---86871688337.pdf
    • http://palyavalaszto.hu/teszt/upload/file/lerosutikivos.pdf

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