Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2b4baaa9d189c9…

MALICIOUS

PDF

66.4 KB Created: 2021-09-16 04:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c75cf8de9cb064ea2fa1dfe675e2341a SHA-1: e51615f528c22589c39c09ef0a559eea235fde5b SHA-256: 6a2b4baaa9d189c93ed7cc63d04bbe51dd1bb345b8deefc9f4066d8c2ac83e88
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7315

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://oniceh.ru/uplcv?utm_term=what+is+a+thesaurus PDF link annotation
    • https://mk-sito.it/uploads/file/bikewujarotirugopunufufak.pdfIn PDF document text
    • http://air-ned.com/uploads/files/mefurokogewuzitisexatat.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/zaxonesizevalutobabukuzes.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090202192799.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f123be36af---pewogujutedesitopezizebim.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1bfeaba336c49af3fc42d39a3adad57a/98241783636.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/94252252401.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109121745186764.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/61594758057.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/rakepugipafelalusemanib.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecbc826b3e---90818813474.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/99282095868.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210911215036_583433966.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/xavatamiza.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/14557923616.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/470d30d6de24bfde6b425d91cd0226ac/soxixotijobodol.pdfIn PDF document text

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