Malicious PDF — malware analysis report

Static analysis result for SHA-256 263c461bc6b3a114…

MALICIOUS

PDF

64.4 KB Created: 2021-06-21 02:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43871ed84e8f640d57e106b8c5b179cd SHA-1: 3b29c5e66ee16c757931b637647ffc215b17ebd8 SHA-256: 263c461bc6b3a11497f2e7ea4d4fddb87916dc2c5e9faca57daa581afd326728
154 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The presence of the 'Fortnite alt account generator' lure in the document body, combined with the ML classifier and ClamAV detections, strongly indicates a phishing or malware distribution attempt. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8616

Heuristics 5

  • 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
  • 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=fortnite+alt+account+generator
    • http://widepolymers.com/userfiles/file/37403166899.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u14gj1si2dlq3bfmk22dkg3tcm/14598682906.pdf
    • https://t2sc.me/userfiles/86929687107.pdf
    • http://residencecarlofelice.com/userfiles/files/94710183475.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/814570e20a5f9967bf84fa0012748c7e/gusos.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a4a9136da---lapemokixofuvafedomi.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fde8255074b30175a8e194403b4ada03/90259487769.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094530e9baa1---68095408759.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/maan936c4qpie4rlk2hh9s0v05/37691615496.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/h1u2bmt0iqov42f21a4pl33kll/sedex.pdf
    • http://jandenzobv.com/image_uploads/file/luvinepagafufen.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e0de3a7cb---70445030569.pdf
    • http://alnoorcity.com/userfiles/file/66289499758.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/1986216459.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e5.bin
8afa3754f316c6b1b483740bcaa408e1b874a5b55e22ad94f9f18019788d4568		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 4744 bytes
font_01_sfnt_off0000c60e.bin
c1cdacb88c8827529f4547a7002002991a3f57c572c05161715a32d9870482ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 4892 bytes
font_02_sfnt_off0000d6a7.bin
92bf4bfc96cff12b1cbfcc21543d6a711e13b25f3fc2939f66d7799df306cdda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 10420 bytes

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