Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ed131025c03675…

MALICIOUS

PDF

68.4 KB Created: 2021-04-29 17:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6fbfc456d6c30172ecc51fd6fb901a3 SHA-1: 295a1e9c9e993dfb9d70ba77b886d42a0395bf86 SHA-256: 93ed131025c03675c2e4869251970055de471da0ca0c935217d9788a1998207d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards an attempt to leverage compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/840a2a237ecf2c424a19ef7228a7255b/61942288549.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/98072e1d59046d22e2e4078da9f36b34/1290543527.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/aaf0400f83b272740f827894e70b07f2/3116091945.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/aac85ae0e3b10d0bd9a040831ba444f2/bukozose.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fa0ec448---kozukatofu.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/u6brcsa9ev5k0ofm48gfal134p/57007045431.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2c8f762d113dedfcb629d26240cb6dbd/79872786393.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/8vl465cf4de6mi031er1m0tg38/bonalejivomuxi.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c37f65272---losulejemedagud.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1527fa5001e50e971ef36e51da693a8a/xesasu.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/78b1db20c70357b01cbca73d57769c0d/dejereropuzebekij.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d5db6f45---62897814755.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4badhrffbm3rhud6jis5ug6a5n/bonuzitatojezad.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793b73f0773---71961829021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sample+business+letter+format+complaint
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d417.bin
8f550dc108603a1e43ca367a67311bd1e46521d5b925aa5e56365328b9734409		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 5404 bytes
font_01_sfnt_off0000e658.bin
e2836dba1fa11c454ad818088c61eac3ae469ed39bd500f0008128af6e733c08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 10340 bytes

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