Malicious PDF — malware analysis report

Static analysis result for SHA-256 50662cea57ed69bf…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 12:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cdc29604054e04c05e0d2c32775a1fab SHA-1: 433d22e061b6487f1d478124b60e1ca3b1c1206b SHA-256: 50662cea57ed69bfa27b2d402b0637bd71d95cc93aaaf06d8227066b75ff8e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination through a large number of links on varied domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607de98ce84bd---66764215358.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123505c01969---51968983006.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xibitunupogakip.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4590ba12dd---486015056.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/bovisewajipurinurudit.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/11133725485.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/kadikutafobi.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jetirilad.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/fdfb507cc1d99e137ad4f5ea18b618d7/87380574256.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/vokalafokutuzibididurit.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/50217145333.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/88159701328.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nurj8cg3lseaf1paqbbpi539e0/jarakavuzulupen.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/21567365489.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/21570605317.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/fekogazisu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/28885116866.pdfIn PDF document text
    • http://kotolantopeni.cz/file/86417327965.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/3531598395.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/94453342588.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098935476385---54755092534.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/dbf88a8eeec4e0fde81396f36defcc3e/filazixafomowoverenufo.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/burixedumep.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092067698616---luzagevi.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746db04bdfb---74862656233.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s7prphq0cmikm58q7pf65p8je7/sanuvojidunox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+history+of+love+book+pdfPDF 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_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 18436 bytes
SHA-256: 945fb398c4b894d76fc944d9cc7ed0b052a4fba574557a8e284ea95dc0680c55
font_01_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 10704 bytes
SHA-256: a0e05433422ed7bff5e0b6bfaad1f0106e2248106ae1ad95ba97414544829405
font_02_sfnt_off00013605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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