Malicious PDF — malware analysis report

Static analysis result for SHA-256 795268092c2dd1c5…

MALICIOUS

PDF

68.6 KB Created: 2021-05-16 13:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd4e3c0c358c3cb881bd6c2fe56c6365 SHA-1: 1f808a775b1cb785f373d2289a1aa78f80bc3fd4 SHA-256: 795268092c2dd1c54f32eea27d8316d90ada89880dd8ddc1cfb50b4697727271
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phish for credentials. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

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 https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3da12b8c255b0c3279563556c3ca2cf6/19785163193.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ea9c4ff1---89360273468.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afd22148e---lovatanu.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f0a9947b2ed0ce4bc535654328039cd7/lisilofoxuxotune.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5758b7d5beeb49df9615aeff657c436c/sojisajadakom.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944bcfaf058---koroza.pdf
    • https://aravlicraft.com/cmsCart//upload/file/8181029446.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d079c98f7e---numenurinutesoman.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2982197d41d76d6779d86ad8f15ef863/demexifolaxinufigageno.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083009fca2f7---guvavuxabub.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160947a9055e2a---ronigejezufek.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b6eec341---bonidakadapotiju.pdf
    • https://poolpoint.be/uploads/file/1115319072.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2da079e0---60018369943.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=7th+grade+exponent+worksheets
    • 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_off0000cd0f.bin
7411ef304bf09a07c9d08a21533199a61381f22119e58fa32a37ab6c4c6703d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 5400 bytes
font_01_sfnt_off0000df7d.bin
dcb45f7366f506a80df4639c7f7a858a1d617a8c2abafac95821696151c3ea16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 11220 bytes

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