Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a3f36849bfc265…

MALICIOUS

PDF

83.5 KB Created: 2021-05-28 08:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b96caa970c7001bfedd88eb08c6f9c SHA-1: 4c18c88c96d71cd48ebb82897b455e9a2eed04c2 SHA-256: a2a3f36849bfc265fbc6b3b0e31c6661f18c5cc941343d2c83c5045a2b799b1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs are the primary indicators of malicious activity, suggesting the document's purpose is to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/454d127f90beb6e9dd34c46b804ad42d/rawoparu.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/4f9dc221b91e54a53caa87cd88b82ec9/94508452792.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2096b39ac---zonigir.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ttuc6miqgvnlmoggohbh6n8gu1/41591800114.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/6puuqg58fno1mf1meik78adr4t/36543918539.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608988a898af8---84517125494.pdf
    • http://ufnk.fr/app/webroot/files/file/marev.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348b8f3f8e---44347831791.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/015f8c5c5fc134c962664541275e5800/remajakumerejuvi.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a0b752578dd79e8a1e6bdbd30559cbf9/refunovavumalixulokex.pdf
    • http://ldbell1965.net/clients/85689/File/1778662197.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ae7638ff06491cd110fe00f6049b7f77/pisuralibape.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1292a494d---roberaxeli.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/242e4aulvtti90jeb7ru29j13l/48313215994.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f20237afe9bd579ef7a2ba7a58265f4e/luvatifilazekujix.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05417d8d12---68784169509.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93b5a0ec8---tekalefinuxemufi.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/07e05ccffcb409bc257492c040985e43/61160913289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cours+svt+5eme+respiration
    • 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_off00010759.bin
65b772c794a8b4ef4af73b18f87c78819f807c71c1ed9a3dbf5f00ef78c73476
pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 5024 bytes
font_01_sfnt_off0001185a.bin
46a78e99e3eb19c4cd6e877756e9cbbd05ccfe055139936f4b6d73df49ea9a13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 12172 bytes