Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72850f183eda735…

MALICIOUS

PDF

44.2 KB Created: 2021-08-28 01:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee94853e3d25f2a8f2d1357240be686a SHA-1: f1dc7acecad369b9574cf1a72243826e34a16d51 SHA-256: b72850f183eda73536143a618fc8607fa53f525d4845c6965f33525487c578cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly suggest the PDF is intended to exploit users by directing them to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7407

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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e28c0e12b---91149490846.pdf In PDF document text
    • http://vswet.ru/f/99992365922.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/66305221383.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620336364.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a2f14938b54991780baa1baa602314c6/neravakagurakaz.pdfIn PDF document text
    • https://carlojans.com/cms/file/49299516672.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f92e03de---44505144285.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/xotasawifuwurizunig.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/fadomotop.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210718_5AF8DA19D4285454.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/63484187796.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff8e872e7b---wukizenefimi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b2f594b93e923f5faad7fcdf947ad833/64453245349.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc27e72f5d---vadivaxazapefer.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/rufasanujuvumefigur.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pc7leg143b2dqs0l1enl23v2sa/natis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3ea93a9b---jotagibuzesanogimixenomo.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/69027952856.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d851ce836---59913715347.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/m2jv4h1upv0cshftgms19njnru/fewobufasumutifuwurav.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/305rslssngp291vqb4pgdqsag4/xogumo.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/lorubomot.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9703c44153---20024352140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=5+shapes+of+statesPDF link annotation

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