Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c0f31a82a7bbfc…

MALICIOUS

PDF

72.6 KB Created: 2021-06-20 22:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d421e8ec64162beb98b86a600d8c9e72 SHA-1: 0e4aaa87515bd4cb0467ec49a354f0b216d1738a SHA-256: 10c0f31a82a7bbfc81ad61623ffd7cc7e00da36dd46213a2160d86d956fc37aa
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It contains multiple links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. The document body, though heavily obfuscated, contains references to 'Usps label' and 'word template', indicating a social engineering lure to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160839701317d7---befowobulebodijiji.pdf
    • https://zop.bg/webroot/img/content/files/zanujozovawip.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c7f5bd5671ddf902d36b9d2475616858/19871709922.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/vfgkh4btsf971iklb81k5pcnn5/dodiredebaxanuta.pdf
    • https://uleiuri.ro/userfiles/file/wuwofuxefodubufopib.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b118d151b4---91182126409.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b6d9dda40e459ee3f4e5d5ccf41f5a81/83322299217.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6fbd1115---57592133781.pdf
    • http://parzenica-bialka.pl/userfiles/files/reruzew.pdf
    • http://adabaskimerkezi.com/upload/file/raxelefasisowisagiga.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26cb5bdf9---62747939482.pdf
    • http://aarogyamedico.com/userfiles/file/wamufibub.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cimej168o93fmjbt87al10oer1/15648933539.pdf
    • http://boeschfamilytravels.com/clients/43210/File/47396901865.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/vipuvetogovuge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=usps+label+228+march+2016+word+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b5.bin
a76aff2b39349538cad7bbc0c632852358a5a932ac65425958f233fe45dd7fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 6212 bytes
font_01_sfnt_off0000eebc.bin
15468c5a538afe85a840d158c68cec6cab8a802718e27a291c937d95d5972c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 11632 bytes

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