Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb15875a9236deb…

MALICIOUS

PDF

70.9 KB Created: 2021-05-28 05:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea24210efb7d5fce6cd7b653a04ccf8b SHA-1: 3bc2b611b8ffc40f8b0b8bb75535e8a5f8767591 SHA-256: 7eb15875a9236deb49554bd3523fcfb55e15af5307383fbf42a52b3ac32cdf82
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and serve as download locations for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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://queure.ru/uplcv?utm_term=ejercicios+de+medidas+de+tendencia+central+secundaria+pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083059b2316c---pojuzezewun.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1299657c6e029fa7f4f12cc101686af6/10221504042.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607634b7e0c08---nilogemilaguweda.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086479414190---wozemisapadutataxidib.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1e81b36525c870b0671d9d9b709aad0c/46117347534.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/fqq8ohegt726fhjavekeo1rkrs/12992472442.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160805fd28e122---44792981796.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gr551f3tb1e63f86f3g5lhtan5/57155680848.pdf
    • https://fanaf.comarticle_ressources/file/77282133194.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3a0d50b4---xewajuzidugazetez.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608791f525d01---talanixelakimidenu.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf03e012c---vewemofejidedegeza.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e9ab6fdf---puvuda.pdf
    • http://amon-syotengai.com/userfiles/file/49920648179.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3df489aac---xonitokulu.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160762009ab08e---18800861975.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/dde1fed98ac2ff63ca015dec5ea80b27/jexukixixope.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e1.bin
ccd7999adbb80a4616b07b482e8eea553f6be568865a898fb19213f1e80a4615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 5336 bytes

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