Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a41ca170df5706…

MALICIOUS

PDF

65.2 KB Created: 2021-09-27 11:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb791453adc926fbd753bf37e3a982d6 SHA-1: 96ef555b68f1edc7f68092db7c041d0bfe7cc9fc SHA-256: e0a41ca170df5706d18ee9f087ce88f09b50315c50b7bea97f20e263134040ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML classification indicate a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6857

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://ketchas.ru/uplcv?utm_term=adjectives+that+start+with+su PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c152edbc2b---mozerigemiwesonijojewaze.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/zodiz.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///88169004.pdfIn PDF document text
    • http://polkovnik.su/upload/file/dilapifepusozawidofedo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e4f19ac439b1e1abf32bfa67265002cf/287986364.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109190930081147.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/23021096067.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/19864082152.pdfIn PDF document text
    • https://areicon.com/images/file/nonas.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/71580141851.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/maleparakel.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8614dead6a9bf1b8c650a15c88a0d694/rukosi.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/50730551919.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/84776802379.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/wagekomepaluvapimuxujega.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4rsa3rlv93amrpdhbofs6epgi6/tuwomimupapoge.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/55840648204.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FD 10560 bytes
SHA-256: e5b21153c81b7fdb805e7fe347e16006e4e3d736eeae99365f6d4c5536d77b3f
font_01_sfnt_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 18172 bytes
SHA-256: 60bb13caf60aec280a0393ba4e5ba2aef4b7e7d384e965e9099bb024ebb1ec66

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