Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb373257b36bf20…

MALICIOUS

PDF

77.9 KB Created: 2021-06-10 22:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6d440ef7d167eb9b76b3f622591a3c SHA-1: a12f9c8a1c1858b279b8af38bf9108ad3a260814 SHA-256: 6cb373257b36bf209ab9927812f929663865cd488d6a6427cec5447d548abd66
156 Risk Score

Malware Insights

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

This PDF document contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malware. The primary lure appears to be a download for 'Tubemate latest version 2020 apk download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=tubemate+latest+version+2020+apk+download
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2psuggjd9vcaq2dnqdsb2oohc1/bilitawefutonunup.pdf
    • https://anmimar.com/royal/userfiles/file/55654165202.pdf
    • http://brianhaymore.com/images/e/file/27571384325.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/da902c50d44f7d82c54e14cf88147159/ronodobezi.pdf
    • http://bukharageorgia.com/sites/default/files/file/sezabule.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/b4uvcjbr0k5kdqoerp1564i742/47004759376.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/78003fb78d038f1254d659f3b551a565/vosuxo.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8d053b7028dc786a1c04b7643f2e961f/xikivawi.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609721f06dab1---najasilowegelivufe.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a668cd478193852b267e2fba9425e76b/xikasokilejaverigo.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160937db726862---63290842100.pdf
    • http://www.gabrielamaciel.net/images/content/file/manatibiwenabuzu.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1704ec84---25199073527.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5943f5de8b---45282841918.pdf
    • http://phantasos.org/userfiles/file/45156262743.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b77e164f8---rujagobuzozukew.pdf
    • http://csc0535.com/userfiles/file/20210608175728_9rgg4p.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608eadcccdfb7---45012703548.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_off0000f248.bin
becc9a9e34079114dc4aa2d70ad939307a41158854ad21a7ef353f080c17ec24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 5684 bytes
font_01_sfnt_off00010594.bin
2ff5d17695d081aceb46d44e90df90feed2c1e76dea19bb9104754ad6993fe68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 10820 bytes

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