Malicious PDF — malware analysis report

Static analysis result for SHA-256 86933c21eff2762c…

MALICIOUS

PDF

58.4 KB Created: 2021-09-05 05:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bff0a25085fc9d5bf783fb1f977e6ca SHA-1: a70c38568f8f9b676e0f31497c42c8536e54ab6d SHA-256: 86933c21eff2762ce2d6f8cae664060be4805777b926d84d1c26312c78ec5d15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9142

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://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6c9f981e78a4b123bb1fb003926fe51/redelurunuvezilupema.pdf In PDF document text
    • http://pogservice.ru/userfiles/file/70609491892.pdfIn PDF document text
    • https://cooperspick.com/files/taxaje.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/mefow.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/1f5a1b8294ab7f1594e9cfe6aa228371/dexifaxilexasa.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/54329633275.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/omup1ba18fb25v1151khqui89e/32018552764.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/615044d8b942d6ce4f7eb88df3d5b27c/fosinotevisejuvan.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bec1dd2dafc46a5644d642eb45ef1c18/13548694304.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/janonenetola.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/96429298641.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/mivok.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9136b3481---13010303932.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/1gn8ntdhis0rm69bjs66mncavi/bubire.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/1689495712.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/lezubesupo.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/fozupikipevopuxala.pdfIn PDF document text
    • https://loctra.net/userfiles/file/nigegexusuzotefadofoweb.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/mojib.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/durogozer.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/61297601665.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/77015643477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nom+035+ssa2+2012+pdfPDF link annotation

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