Malicious PDF — malware analysis report

Static analysis result for SHA-256 4301e8fb9c53c2d6…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 12:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9543636f2623d84abab10d8c1d730ed SHA-1: 7bf2edb6879089b2d9c2e6b39c1cb528e4476f77 SHA-256: 4301e8fb9c53c2d6033cce72d6fa20a6195efb45e5a887e0043a0f41b809226d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised CMS upload storage, 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. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160838900cc286---34030528407.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3f7c421bc1bf19ce7a12e0276d6f9d7f/faragegalijakarikujalirak.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5667e2e413---59337861772.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e287469259---gatuwemuzifajirabu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607585e2d0d2c---binasotodonesinovifajiwil.pdf
    • http://omonetach.pl/foto/ilustracje/file/popepojunineloke.pdf
    • http://absigorta.come/file/82944885859.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070908403a2d---7663375362.pdf
    • http://club-integra.ru/userfiles/file/bizabetamibutupofopesepu.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/68c4998d54e3c13a5db296dc5314a9af/96035788054.pdf
    • http://bitite.lv/media/txt/122/file/sibenofevebawinitonilejas.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b0c59c39e---lemilepag.pdf
    • http://thaiboxes.com/piceditor/file/miban.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/1973803631.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4jimli3c3o374o27pfv6vi51gj/50400631689.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mcq+life+processes+class+10
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87b.bin
8265bccbbdbecf630b629ba76b10dc9fec0459a2e13599eafc9e83c53b80dd27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 17256 bytes
font_01_sfnt_off000115cb.bin
e32c5420cc9de7deb28aa7ea63b82f49d6aab25b5cbc6415f3884efa7e703758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 10584 bytes
font_02_sfnt_off00012e15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 16792 bytes

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