Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60cb47c68ccb271…

MALICIOUS

PDF

75.7 KB Created: 2021-06-11 18:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 490a4f61d6979c3d8d3ffddcfd917326 SHA-1: 64c908b606aaeac2d54523d88f3b86474a742861 SHA-256: c60cb47c68ccb271b0b7aeba0e17b7f74dd6b2198ef8fa73d51350613c0d7ea8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads, with one URL specifically pointing to a PDF file. The ML classifier and ClamAV also identified this file as malicious, likely a phishing or redirection attempt. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to lead the user to malicious content, potentially via a spearphishing attachment vector.

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://infrive.ru/uplcv?utm_term=the+notebook+character+names
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0199e6cb4---tonunizizebiguli.pdf
    • http://x-site.by/upload/editor/files/mufiwixakiravibekuxapemuz.pdf
    • https://condominiovillage.com/userfiles/file/vetejiwage.pdf
    • https://avigailpekelman.com/sites/default/files/file/11626763080.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/66706219251.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b6fe0972b766ffd9c4330853fad5017f/vojavigenezepal.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb2564ba5---xidive.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef8c5b363---dotupujebixudeporukoxoz.pdf
    • http://prodottoitalia.eu/userfiles/files/87955997499.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08ec0e547---ramoxolofawevoramemi.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ac5ba0d8c0d9ed52799b6921a97a6838/vixivutixapi.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd5b0e0f4---foresetebivenexek.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608177ef0bab9---vanijaxerebudina.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4ee8af1ff9ff41029751cc536d1a9cf6/vozin.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/dfc582eb69409177416b9f4c73045eec/6528207589.pdf
    • http://dfh-consulting.com/userfiles/file/85125010957.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab209971e25---8308009315.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_off0000eabc.bin
ab0705c6b67a90e9de06b6a4f1aed66e957de7615a746c0529f6a718fdedf9ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 5160 bytes
font_01_sfnt_off0000fc22.bin
68a6b6564227eae3e340fe9ea2331627557fda3a35ee1660201894544d39a106		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 11080 bytes

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