Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff8867f758a3289…

MALICIOUS

PDF

56.8 KB Created: 2021-09-01 21:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b21279fda80860c771ea495e13730f71 SHA-1: 7f9378bf44780b08697b6d888ad9fc3712bc8725 SHA-256: 5ff8867f758a3289d4e53994220f40d2f5cf8297d08ad1c7fd6ad1f3b4d55e0d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9032

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=nintendo+3ds+games+rom+download PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f778a6d0---jejak.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073762bb4ba1---tugal.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/48839680235.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4a37fc666fe354334f9cf91e86968e98/weripevoxalul.pdfIn PDF document text
    • http://skupka54.ru/upload/m/21032577375.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec7294a34---likorajelimeke.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/48577932932.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/18870724246.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/bozasikowi.pdfIn PDF document text
    • https://noddy.nu/images/file/fifuseru.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/47219101248.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/64285361129.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/70028917311.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210808_100720.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c3bdee50---35279474118.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a66392c92ab---marelulaworogumi.pdfIn PDF document text
    • https://birudongker.com/contents//files/41718703836.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fb7e6d67---kiviw.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/zurutolurusafamavepo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/66391510849.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9dfed43ecf3b506ca5469dc833e5c0e9/62992251650.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pipujuxuzotixubuxed.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/72164555187.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/dagutuxovunozivinufiv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8286pgrhrukd9nb5qnkdb1fo33/82741101365.pdfIn PDF document text

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