Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d16d5c81ffe19ca…

MALICIOUS

PDF

52.0 KB Created: 2021-09-25 14:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b31c9179b57e64931ceca928462bd236 SHA-1: 76436d0f0a6db96b37d75cc2ae82d3ca21179ad1 SHA-256: 6d16d5c81ffe19ca7c9156b934fe4e041fe4ed4c3191927075e47c6435171a0b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, despite some being marked benign, are part of a pattern to redirect users to potentially malicious content. The PDF structure and link farm nature suggest an attempt to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6164

Heuristics 5

  • 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
  • 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://b2b-intelligence.it/uploads/file/77571459797.pdf In PDF document text
    • http://186086.com/upload/files/31467273620.pdfIn PDF document text
    • http://abworder.com/uploads/files/3460418338.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/jizezanemifuzaf.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/pebilevoluzifapapiv.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/30772518719.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/21f22fe9f3268285f784745807587e70/92981156446.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/91510768724.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/71458161873.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/56684719110.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fosiboga.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3244933f5---gopisexewofivaxugakatexo.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/50233626851.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/kinoretase.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/nilinepi.pdfIn PDF document text
    • https://wittnebel.dk/file/10768911616.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/dudapuzejumep.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/76457977734.pdfIn PDF document text
    • https://dom-titan.rs/files/zozesir.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4e2ea794---56814559575.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/vetunefiguwuguxapisite.pdfIn PDF document text
    • https://fobh.net/userfiles/files/74771567263.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/30047856237.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/paseja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=en+son+android+g%C3%BCncellemesiPDF link annotation

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