Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84508db8a493f09…

MALICIOUS

PDF

119.6 KB Created: 2021-06-11 01:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 41747686705d0345d97dd442aa0835bb SHA-1: 732a68e880dbb4b480ff4a8c58f9ec01a8dba3ce SHA-256: e84508db8a493f0917dbbd90275df68c3d1816ebe977a2c37705c1faa2a9a2fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9312

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://crewmak.ru/uplcv?utm_term=grow+defense+hacked PDF link annotation
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/31ce8559e9660bdd43424f7d7456b212/89910384158.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/16871582954.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/777bcad089219e7a45ff97e02538ac99/dapozedusanut.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8288f713c4de14f37021f21aa132c9bc/95819621276.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ce0441e89---29860371829.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc664a8603---86300159244.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e06d8df786433df57f5397bd51c8e5f3/kufimow.pdfIn PDF document text
    • https://andrejc.si/files/file/farowukuposuta.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c286670b4d1---kisezodomobumewiwoni.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec5e61d77---rajukasatibulu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdcbaf9fa---36873604119.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/295793eee6ef032f7565c2ad1bf3c5ba/jisezodilupokerigijov.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/famowi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e62d515b5---98830947682.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9cb6f536dfc967e6a08cd7a0f04f6315/wagubolifepixilefoli.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c4aa85b2c0bef8c79d985eb89856f87b/99123371635.pdfIn PDF document text

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