Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f33bd67b2720124…

MALICIOUS

PDF

66.5 KB Created: 2021-09-04 18:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 336c01a970f5f8b4161b51f79f95476c SHA-1: 7eaada7dcda17d79ca0443e1ada0567ab51623a7 SHA-256: 5f33bd67b272012466b273032fb5c09260cf9daeda71bc580a83cbc2ad509bd9
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7500

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://wastran.ru/uplcv?utm_term=2015+vw+passat+wolfsburg+edition+owners+manual PDF link annotation
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/jbm8rj3dhpb2jhearb6cqluhu1/sodirusorifunuzumavujo.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/083eb730d8cf02885ea3e05a213e4f0b/buvozumozofa.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8256c0301---venoturuvuminejejepovaj.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/kediwibudakifefa.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/zumibuviwasi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b671f12ea---22244358988.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ca8stoj1vrsnddg4u0fpvcai07/koxebomexewok.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176169a52c---fezikebipujufuf.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53ea711d9---64949535422.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/rexebexedisunurilaremi.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210617_163328_1612.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/0ngg17qprhcer5s9ni48ogo9a0/wisuken.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/zufabobuj.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/99660399565.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/nabufogurot.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/3938587582.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/2855610531.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/68793906319.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/88b0f3d30272ffdef0a619fd716bbf2a/letufu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112ca53f3efc---dusawe.pdfIn PDF document text

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