Malicious PDF — malware analysis report

Static analysis result for SHA-256 267f2c864e4c683f…

MALICIOUS

PDF

77.3 KB Created: 2021-06-15 12:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa6f26e24a30f1bf1cf76cd56142dcb5 SHA-1: f8b36fda08e4c92a40d4bb03aedf2a5668f2a17d SHA-256: 267f2c864e4c683f6cbaa9ef11d6bec7f3bf3e5f42f0b006c34fd281d92953a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 https://infrive.ru/uplcv?utm_term=amigurumi+husky+pattern+free
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a38ac39fb6640e26eec44f045989455d/rekugufajipuzewit.pdf
    • http://jevades.com/aircraft/fckimages/file/jakufoxugosoloxuxuf.pdf
    • http://ipsgroupjjn.org/userfiles/file/maxowuvomuruge.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a529708842c---najevodivoroxewof.pdf
    • http://brenna-ski.pl/userfiles/file/goxuwewanowopuw.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160967756dd246---kozijibomodefagipesi.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c2b51a58426a02e7ccf6edfd1128b0dd/45672657823.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/mjapc1dhq3uli32vnru0a20bec/gizoj.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6a030f2ca809ac10bbbf07a90ac10b87/jivigokenedexe.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea3417888---mevopizoxigawoxajal.pdf
    • http://nowator-zpu.pl/userfiles/file/19649343615.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608be9349023d---80668546519.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac62ce170---lupupema.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3t9hlkn6inq8hidvkasb47tld0/fepeginalusan.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9712166df---pujidos.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/13625083163.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ed3c.bin
7971199eaf6fac971ee7370742c526f0923f7f377402675a77ca3e98f2b236ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 5440 bytes
font_01_sfnt_off0000ffa1.bin
516d0385af9f9e5cdf6a2f15d9d66a022096ce98a424fff573eeedc26fcfc361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 12672 bytes

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