Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ab9942a06aa603…

MALICIOUS

PDF

96.8 KB Created: 2021-06-26 01:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: eb48d3bcd5454668de12652f418c0284 SHA-1: ead7fdaff475ef24ffa2788289863d83216389d5 SHA-256: 16ab9942a06aa6034c4aff67f8837e4d9b368cfca716db9b5e2d41ac8a3802c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites using formcraft or super-forms plugins. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links. ClamAV detected this as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d9d9e1a25---rukow.pdf In PDF document text
    • http://uforoi.com/app/webroot/uploads/files/68931277055.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/728f503fb988a8757ddc450cfb6b7baa/52945552263.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787114251ee---tipewugibukevoxafuledob.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160846f123d5ef---xuboze.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5c49505a---51470073748.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/nebuxabububijunara.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/eb66c83151b9d9f489c3c94a407f8611/33994869308.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078d7fd4cf4e---27977620286.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/gizimuvirewaledoxidutadij.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/e140afb0e330a4a8811a052b3a54c7ef/sedilafiwowa.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/54826985213.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8d7c86a61---jibowopojomo.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/84553914230.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/miditatanawutaxanagix.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210515/file/16210222963509.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/jupitejezix.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/de2f3f0a7d82df62332b2cfd807cdad2/62340479633.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/xolalawazolaminolevodalo.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/xutemesudiwaji.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/cc9a8e6e44b5d8dc27558d9b3aee4499/xetufafitudu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bc2356f8676d4cc3754dd6bc25ef7ff/gupuzajijab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=proselyte+armour+osrsPDF 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_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 10288 bytes
SHA-256: 8c3add9f731636e29209054eab99f27e9ed80f76b8c0a6937dc5c376041522df
font_01_sfnt_off000131bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CF 17032 bytes
SHA-256: 472885a4583649330eef183f223092f13df794eedcd1b348f83d1d47bce2e099

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