Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be6af34f4070e2d…

MALICIOUS

PDF

93.7 KB Created: 2021-08-26 03:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a50858c95e22a0a9b953ebbd100ccbfa SHA-1: 569d52f52dbfe4dca2c27a7eea982431f58a8d32 SHA-256: 1be6af34f4070e2d5c6bd52ec975049f4eb5a54774f6840abef5c316d0cb3bf2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a link farm designed to obscure the true destination, likely for phishing or malware delivery. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=learning+spells+from+scrolls+5e PDF link annotation
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f397d72cc83---samigaxozuzolal.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jolujugazesidivov.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/56810207058.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/roforazadedigu.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/95573517514303fa69155277a224eb21/zotodapubobowoj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609971d57bdde---wipumogokamalavedul.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/zazasebekeda.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/86479189579.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/33551059791.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/19703571070.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc92f5b9a14cdef2e74f782ec3360783/novizitajun.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5d61fdf2---53537987634.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/gasexajelevagejuretu.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/78061332494.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41530319412.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/nazilusige.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/44598922692.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/24575902258.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a565d9f37b---86520913207.pdfIn PDF document text
    • https://fishuntpesca.it/file/51050413201.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/covna6ae99hdhukunup3rt8rgu/83373326597.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/lazam.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/41930247048.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc7e1fad8---kewenixunefebewifike.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e16238849---68316108260.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160752aeeb3705---69793785204.pdfIn PDF document text
    • 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_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 10816 bytes
SHA-256: e8ce840c23bf95900a58c75337f389c337e72368d124c01fe2db457bf09066f3
font_02_sfnt_off00013ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 17280 bytes
SHA-256: f7e203b0b2c1a575eb3aa94e31c004afba189734a84e7901991a0232a4f6d600

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