Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca17c82c21d6e18…

MALICIOUS

PDF

78.0 KB Created: 2021-06-19 10:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ce0112d7a0d9d4ac46261c9a34a946e SHA-1: dd319e52f2808aa13a202511a2919313dfc6cc0b SHA-256: 8ca17c82c21d6e181901a564f4bde49cb1ce0a3108f907c339566f4676f29856
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to downloading MP3s, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71ea15ef7---6297413656.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a738396faaa---92402057720.pdf
    • https://evergreencans.com/userfiles/file/bojaxuvavulurifulagekan.pdf
    • http://dzbnf.com/upload/file/%5C/rixutukinapazixizodebezoj.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/79753328417.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/njh1p27d7lg6vikj0lahg7r9g5/xadolerexonoleviseru.pdf
    • http://goref.ru/files/file/ziwiwe.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/096264ee591e3a7f56c2d4e958fe1bab/jedafifi.pdf
    • http://casier-a-bouteilles.fr/file/kiwuletorusokutagivugunal.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4bb463214---zavatazesuxoxudavurawe.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a826568494f---36604215115.pdf
    • http://amsasecretariat.fr/userfiles/file/36055938231.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/54da0dad0c6e57c4089d77225861f72b/saxomixusizefowisiruxan.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jo0g4l0smkne4d5cg6unpimk8s/90335876580.pdf
    • https://twr1115.net/files/fckeditor/file/82205374510.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/er63ud1mfpgkc9joit88kghpk2/96554931587.pdf
    • http://zrdb-drogbud.pl/Upload/file/768689662.pdf
    • http://stellamaris.cz/userfiles/81969558572.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=celine+dion+all+songs+download+mp3
    • 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_off0000f35e.bin
8c6024e987fb83ad3b6915d04efc1b48310f2fc018683c0cc0b97bd68f8cba69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 5344 bytes
font_01_sfnt_off0001058f.bin
1082a3b61c5afdf500cfc4ef034d70f04c7990186febdd2ee1d058213e10271f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 10780 bytes

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