Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbcf64c82713127…

MALICIOUS

PDF

58.7 KB Created: 2021-05-13 16:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d71c0969f1afa2c22a354d1e63d7be5 SHA-1: daad1341aaa06365e0ca1859f572f3fb4ce80f85 SHA-256: bfbcf64c82713127ac3d4aa90486d8c676fd8b2626e7831e6961328f381fa7e7
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The document body, though heavily obfuscated, suggests a lure related to a song download, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7731

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/etrbj63o951ngfbh6bdq2mrjp1/85774404988.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba711ab6a---51491481770.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/mr6hr5spd0qie7sea6235k82gv/11077794559.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a5ab1bd---73973362018.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/350689d63330ee47ed2cb8fa1ece41e8/tawojiwisesozufa.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/srv6u0sviv5i93toi1cmtb554a/tividujetuzirenotereviku.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/af9m2102cvq6tg304dfbcki1o7/jukidiwo.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/94b18731cc3bf1474021b931f4f7db09/duvujukaroxonebidorera.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609241f9ef1eb---30938403441.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/atnr3lrm84fvdlck0cskhoqr56/39461283404.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ca5e77cc---74639287431.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/803a1a220bffd60ea7c189030632ce67/28935304830.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5776584bf4b8704ec47d5a9a3d7d331d/melosamitujoveguremapuf.pdf
    • http://www.hydro-tg.pro/upload/file/78909247540.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2109c8c8cd1eacd360b469af5c289711/kovunufirapagejudevul.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jsd44e6qap1kmm0nlq7o0mjkd7/lasuru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ladki+aankh+mare+simmba+song++pagalworld
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd4a.bin
cb1710376f8bd7bfc5e48332295ee81fe6b64d0562f5d38de4436fc70df1e467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 2900 bytes
font_01_sfnt_off0000d788.bin
8c85e29f9afa8d6c374f77a49302771612870705e5b72c1d2890000a2219eeaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 5612 bytes

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