Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e584a18e7519923…

MALICIOUS

PDF

71.0 KB Created: 2021-06-25 10:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 998fd6d924b9121baae05a757811eebb SHA-1: 29c20233637a2d287a055a90b27d065f0c4468c9 SHA-256: 7e584a18e7519923af238605bc6204b88138a928928ff7d96e6702c0daaa52ab
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://inwebjor.ru/uplcv?utm_term=company+law+mcq+book+pdf PDF link annotation
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/6ptdieda4cds04lu1p3jlhteoc/2175067156.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/57319663388.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/cec48fa0bc1fe85eab92ac25f77db6a1/80122148399.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12e58900f---85597767800.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ccc5763f---nolidobabikixudig.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/96621234667.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/81363799346.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/n5r5a7eck78s2a55mkisv5mno4/68639664928.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file/%5C/25396804882.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cc14fb1d1ac4e8778343dd9989545c6d/punitegaka.pdfIn PDF document text
    • http://blueyee.com/upload/file/152223594984.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/jukobedopisolixajole.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6feb4b9563b55d46cd6c3c8fbd3b9a3d/21833570482.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/lonovuxijadomejo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08543ed48---69633904175.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECA 5456 bytes
SHA-256: f60a9d033f513785fd02bf7203cd5187f8e6f2185eb5c09ff56da470f180932e
font_01_sfnt_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 11704 bytes
SHA-256: eac5852a707c9b5c8e292ec8414b4115522f8b093091110e4461abb12a87615c
font_02_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 16400 bytes
SHA-256: 3f5d6e97f6fcad44bc21810eeac96dde21513f39987572470df5309386dc6e93