Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9f401e0697310a…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 14:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de2677dd4180f0b33ee3aaa0dd5de0a7 SHA-1: 9883c1837df05492887a9399ef92f7499b83242e SHA-256: 7e9f401e0697310aa8ab29620693bae9d13225244b3a7584110fe76ea071c4a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=heart+beating+fast+hands+shaking
    • http://fenotropil.ru/userfiles/file/guderiwa.pdf
    • http://tlproduct.com/userfiles/file/58808034880.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6a04771955f40e702e1e070621647d64/76999776088.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607564bba25ad---junawelolizepisevukor.pdf
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/86839445455.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/2qafodslj8bm72570p1n95n15r/wetupakaxusupomulebibuti.pdf
    • http://esoftland.com/userfiles/file/gimib.pdf
    • http://sushiloverca.com/uploads/files/68628639226.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6d643dd9baaf9485ea4b3922cdc88d0b/1774977783.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/44697062620.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aabf56080---46026098523.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec63da18a3---44472595588.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/tigibi.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcd92b50cb---20068323198.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6bff402b3---99965865334.pdf
    • http://www.odnpoznan.pl/fotki/file/file/38691978320.pdf
    • 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_off0000e505.bin
9d10213eca376db55a763a798647df163d7e07e37802a1f97cfc5c51ff66475b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 10692 bytes
font_01_sfnt_off0000fd40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 16792 bytes
font_02_sfnt_off00011552.bin
a18e39cbe853adca01e70d4f02b91fcee067ca2fd9af1a9ab5d282db1d244b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 16580 bytes

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