Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c8b378521777f2…

MALICIOUS

PDF

186.1 KB Created: 2021-05-12 12:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9fc1dfea04fe48548b5b07b907dd5fd7 SHA-1: e3f9a3794aded57b35381a7ca5f821b8048069b6 SHA-256: 98c8b378521777f2a088038d67b6e971612a270e618c2e7ab71b14b5c4fa12a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098757a9e446---modeniva.pdf In PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/04bc93f4460f537fe47f21a221757657/bikojebukevov.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/hitnuu4dbbna807ij1ub3easa3/mavoladipapatisex.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160786bedc97af---14612676300.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d0baf48d348dac7d9ec9e7f5b2633632/4456514946.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/10d84b8f6a613f3b9491e33c84aa1787/kibutoporuborexegi.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3ef25941---57999397805.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b6c698caed0f60e1ff0ef1261395238b/xuvizivibawuzewekulixo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8e779f292---rajuzelurozavew.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0879d9ccfddca819e9ae2f301dbbd52e/lakunizajubirarixesidekep.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/dupulede.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gro0empnmdrfm4dbv1sbdck3lc/54674800617.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1333734ebd7984d1a3685d2bf5d5b02b/bedegixebo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80a328003---88166812304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=aha+guidelines+stroke+tpaPDF link annotation

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