Malicious PDF — malware analysis report

Static analysis result for SHA-256 542e27257fb24e91…

MALICIOUS

PDF

69.3 KB Created: 2021-05-23 14:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6361680cf34d1c1ff1f675d2d90be74 SHA-1: 06b9033048e7d7e2f589a4f5dbb0e4114694335a SHA-256: 542e27257fb24e91a0486e0c3ac163d1bfa8ddf47da9fa6babdd9b8bae0f1367
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates it's a link farm designed to exploit search engine optimization, likely to lure users into clicking malicious links. The ML classifier and ClamAV detection confirm its malicious nature, suggesting it's used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7687

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://chcial.ru/uplcv?utm_term=spanish+english+books+pdf+free+download+websites
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0333ed1a---88841233546.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/2bgpgtqgp4r2emrt9a083vvfus/fumelijituniguge.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608053e3ca6ab---sosekupifonokile.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/83e1004562737c5c128752c530ad8ff0/sokazosufukotuf.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8b988da5d6e451c84def976f58ec33ce/22704981066.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a19cdb7cec0---49196989825.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9355156137b0c1d2859800d0f29efb62/sosuvuvepikulomebaji.pdf
    • https://armagedonspedycja.pl/files/file/nilalisomaxakozapiresi.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81908d013---tewak.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/46b269a06bdcac16eb316850dd40fcf9/ruwekidive.pdf
    • http://eurekaelearning.com/upload/news/file/61030615378.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160716daaafc8a---kakisirenusokad.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c71942332b151c2f20e9419807cb558f/82289984813.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e106.bin
c3ec0ff85aaec7c722cb0e5667c98545c4b6b3a3cb3bafa5cb60b7ee825a421c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 5704 bytes
font_01_sfnt_off0000f473.bin
6a872b26ac8f409cc9568cd9371f93ef924796140a237c9259e97f8b143a61db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 10640 bytes

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