Malicious PDF — malware analysis report

Static analysis result for SHA-256 226f40161f6318c9…

MALICIOUS

PDF

85.0 KB Created: 2021-07-21 00:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39423a7017afed337599c9b2f34fbacb SHA-1: a0fe3cf4669036505e453441a173c5ddec261455 SHA-256: 226f40161f6318c97545499d93ff4683d7a5c2aa0d59fd5c40348505f1795a13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL structure are sufficient to infer a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7ad7919c079cd803b44ab222d1273753/87531856202.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/47e272a27435147461ff37afd28cac73/famebelujije.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/78528012546.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/mireguzajudirulupex.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18550b9f68---15021552549.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/debuwibalorama.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/61a6ce353ea1f80b421ba248ae84d876/metefigulugabixali.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/gurumorovetuman.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/r8vtnj87c7jos38qrat1419u74/sulovukizerikufobokav.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/88200335659.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/tibuzi.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/zogewoxi.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/rebizolirutotiralex.pdfIn PDF document text
    • http://greenbrier101.com/userimages/rezugejedekijasoxok.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/lunidugifototasadividotot.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/memumezafipifotomanap.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/46762470865f86922795140b7e987cb9/73453459499.pdfIn PDF document text
    • https://melz-feu.ru/upload/waxugaluzepubibe.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/moauf7q7v4qv3amv5qf7c9elgj/navaba.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e190ed7556---vuwatozosedubunovi.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1b880fd58dafd6b66d5328aee483305b/90764050079.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb4bf1fb---natobozusidetani.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/zojugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=green+hell+forgePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 18564 bytes
SHA-256: 9e1f34580810cc56c2a6eab5357bcb45500589e8f79d6956d642b8876dcbb33f
font_01_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 10012 bytes
SHA-256: e51c31ce1d073245d5a7e3f3a21ddb8db154afeefb61cbd6860ff085da2c724e