Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce27288ac73b828b…

MALICIOUS

PDF

88.7 KB Created: 2021-08-26 08:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 783e7ede437b599712b8bfdd3faa8ece SHA-1: 2c7699c1b9fa59c788f045fb7b1430dcc62319f9 SHA-256: ce27288ac73b828bf1e65ffb5adfe638d10651fd6fba3a64bc36e4a64555c1f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to numerous external websites, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it's designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ultralloy.net/upload/files/funedojaruxujegitogiz.pdf
    • http://ncabhsa.com/clients/875427/File/tezipuvanexekedu.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdc4b6fb1f---26645256960.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608048242b3c8---55308746847.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sjijm4vukldf3sb39sa654tlp2/zuwetexuv.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6d46f43eedef82cb6e0f7d74b578795c/pezazovokapebapetaran.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1ef1ed84423b81af655faab7eb08d34b/pirusexikuvuxudawofo.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9136dce303---velebudumitarixevu.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210708/0219029975.pdf
    • http://pasted-radio.de/web/files/46855017245.pdf
    • http://abnicum.com/files/file/98822101121.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbadfbdb8c7---nogukuxuzateroperi.pdf
    • https://e-ceramika.pl/userfiles/file/misujenigogek.pdf
    • http://pileshoppen.dk/userfiles/file/rilotagemelerer.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16113bbed58788---lumalave.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72daaa01d---73473729553.pdf
    • http://iburgisidimarsala.eu/userfiles/files/bukulotijuse.pdf
    • http://idealhca.com/admin/images/file/seponidirerakawiw.pdf
    • https://torgradio.ru/new/files/file/19270227594.pdf
    • http://asesorgubernamental.com/images/file/tevurer.pdf
    • http://ekolojikweb.net/upld/userfiles/file/12621058257.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54c8c7c447---13857250559.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cbv6vue9nbiuaahkiji06hf7p2/mutunafowutajavusi.pdf
    • http://rdmsrl.it/userfiles/files/76754635070.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/12fa1njuvaocq9fndpnn8h678n/80646549612.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=plagiarism+sites+for+students
    • 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_off0000f87c.bin
9970219ae3486851e2e07599209bd2c267383f9987c11c3beebbf84d2287ff18
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 16916 bytes
font_01_sfnt_off00012432.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 16792 bytes
font_02_sfnt_off00013c49.bin
cd2a55fcaecc4ae53fcae2fb78e56b84e0d686287cb84e72f7d87bb0a173499a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C49 10796 bytes