Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec428eac34032988…

MALICIOUS

PDF

63.5 KB Created: 2021-09-02 23:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d0ce77819d0f7b07bb5619532ad8f5f SHA-1: bd37c3f48bc75beee125b3d6502e2be4bfb50d45 SHA-256: ec428eac34032988bd6f448021553d0def0239a054116cdb06c1b6d3a5556688
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of 'utm_term' parameters suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7267

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8c2207db---zilexenigibamik.pdf In PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/zawijutaxuvulovege.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/77e7c7e348556db7a391fd14ab6419d7/xelurad.pdfIn PDF document text
    • http://com123.vn/uploads/file/16788824901.pdfIn PDF document text
    • https://phr4u.com/files/tuwarinizebogopixetemaxa.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/jagimisudok.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/rajomanefobasu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/teder.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/71789810937.pdfIn PDF document text
    • http://stattus.com/assets/file/xudomexaropurive.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/vudepa.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/rerizofufiwur.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/1247916802.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/piwikapeduze.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/4d517aaa83046edb6efe59999f350113/5554453969.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/60042329481.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/titarububelu.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fc88c6fa77371fdc4ca15a0ae9bc9728/16351654033.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63dd9b4987---foluzutaluzewadamov.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb039b3ff---riwexu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1628247524.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/13572141464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=indesign+online+pdfPDF link annotation

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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