Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dafbd853eb6a54…

MALICIOUS

PDF

73.6 KB Created: 2021-06-01 12:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 745d55f03766eec2c324fe3d6dcbcc59 SHA-1: 4b7356d23f0f15f8c8fec273b5f5af45284f4133 SHA-256: 71dafbd853eb6a54c0c2d5eb4f1490813124632703d0cd08651a6e5e24fb1513
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to product reviews, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085da366c346---21372772655.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4e65f600---71511164627.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lowamarozewitaralekifob.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ede60c646f---kawizew.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5lvf33p6v44767vjs0mlhkqjsc/jujinuxupakarezalu.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/26728141060.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/22553534715.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1dcbac646---xatifenisadawiza.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b45578aa3b4---gupuwataji.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9b05fc5fcb037e1a64810bae54575e39/nesafitupupopafevofujaseg.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3df88d2f1d99d66212ecb127f6f23864/46399684008.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/tonavevolabowoxoriv.pdfIn PDF document text
    • http://soles2walk.cz/data/file/13836811230.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6ca124506cdbd1d9c9840584562053d/4931495195.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29707fa22---29995296550.pdfIn PDF document text
    • https://energooptima.hu/upload/File/kadafozexidunew.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a06f0b5cdb36ecadb71c6e3e88272f4e/50451207277.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=boots+verruca+and+wart+remover+freeze+spray+reviewsPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 5624 bytes
SHA-256: 7349e7918df275b94f143cd90d954bfd2f07cf14463eefc372c1df4c8feece59

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