Malicious PDF — malware analysis report

Static analysis result for SHA-256 2858f02b1669d45c…

MALICIOUS

PDF

62.9 KB Created: 2021-05-28 16:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 798882e9c1d5ab8e35e8e944c6558b8d SHA-1: 79196ebeeb8ce22770c78faccc10f3ab6f17552b SHA-256: 2858f02b1669d45ccb792f56e6fbabc298654769d440998931693a3e07165657
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8425

Heuristics 5

  • 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
  • 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 http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4grrkrnagunllvh5pqn818leh/96627437622.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981de6da932---ninodukigotakujuriw.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/6d49e7123479619bfd6671e03a4eb05c/65165771684.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607592af5175f---jurikeguzodilazelanuvesik.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca265d02bb---zabutojodimakojeligabero.pdf
    • https://accuratesearch.com/userfiles/file/menogiborif.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6ed5d8eee912a27c69ede30d0f71c8fa/pibiwojabilutuwoga.pdf
    • http://kcde.kr/userfiles/file/togerulalelafubijomiban.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f753fd8af446942ad09c094b2aa7756b/babavuk.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/zunezorinidakepabil.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bacaa9f49---30091982205.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fda87b7c2c7efb05d81dceefa088ccf2/83161659808.pdf
    • http://biotledlight.com/userfiles/file/%5C/novagupifiborugilibize.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f3f46a3b0fb3fd75cd3dc3470c789939/pokitexelogeritawame.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2f20e9e17427b2da7067068117acb4e8/64432304308.pdf
    • https://abofahed.com/userfiles/file/gozikaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+kind+of+battery+does+snark+tuner+use
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed72.bin
47f3660187170391fc44a9716b5f1b9d1f6902c160e2d593dcf73e01afd1f2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 5164 bytes

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