Malicious PDF — malware analysis report

Static analysis result for SHA-256 333fa4652270a8a8…

MALICIOUS

PDF

77.3 KB Created: 2021-06-28 06:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dd3066eae258acd96a786c8fcf9e638 SHA-1: d7e23c7991b03a338a44849ee0b218d1d2b57171 SHA-256: 333fa4652270a8a8eee99f1ef6820023c7556a6f6701705fe86b1e0b6d8a816f
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=watch+badhai+ho+full+movie+online+free
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075a28006d13---28625118715.pdf
    • https://erdenet.mn/userfiles/file/59170576104.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ba3cfeecb4496f518ba43d7a96a10a33/pukadi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac26050a3b---xaweso.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607361f9255e3---duzuzilijalukukopum.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9cb3117a---49915340867.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87aacb033---rusovamexifexiker.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f42f1b3f4---21527845572.pdf
    • https://mk-sito.it/uploads/file/67554942003.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8f21c24c56b4bd886487cb9394f9f1c6/sipozokobekisatelilu.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4cdcdf3560ee5ebe9fa7c3856a6f7cfc/pabogutulatavotitet.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6hjvq8rjj37sq3ajuvi1ss1hh4/lunoretowilukevupepewul.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bkktsreib2savkuvdu8qkuqu1p/66107341718.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa409826f---raropawewudemarapu.pdf
    • https://avigailpekelman.com/sites/default/files/file/gisewenufutibixisuj.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092d61cb87ee---foborudexawamakuwusawina.pdf
    • http://yesilderecine.com/admin/editor_resim/file/zorapidiwaminimujasotawo.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4a97666e135266f4d6e36b84bb91bef2/25054393040.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7c94043e---mefiritubijazosepejivufo.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0598ac1df2---12663162511.pdf
    • https://duproject.com/uploadEditor/files/fuviwanolaxazesem.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/dibiwipunavomokutavuta.pdf
    • http://b2cexpressdemo.com/userfiles/file/76942125735.pdf
    • http://kashima.cc/userfiles/file/3316039851.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/vdu0b5778vome8n4qtqlb4fb9k/kewalimakijupumejubitesas.pdf
    • https://stalbeckers.nl/userfiles/image/file/kubuj.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_off0000cb5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 16792 bytes
font_01_sfnt_off0000e36f.bin
189f99f22ce7db3090cf3a789d60a49790ccfb8284f7d617d962a4c5f88678ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 16620 bytes
font_02_sfnt_off00010e96.bin
50e3beb34da9ee0556c9451b752eb6c6dcb6f84ff3284b6b53745fa3602273fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 10872 bytes

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