Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e1315628dff70b…

MALICIOUS

PDF

95.6 KB Created: 2021-06-15 14:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2015769600e7df084a9dde20465a341c SHA-1: ae058313df113fb3fae35787f36b1b75d710179b SHA-256: b7e1315628dff70b9980ea3e201a73d4e223779aa6daf9ad9ef8994b1d490797
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains strings related to lesson homework, acting as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7907

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://archism.ru/uplcv?utm_term=lesson+13+homework+5.4+answer+key PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f633a545b8365d9492598db41fa94048/56491568771.pdfIn PDF document text
    • http://edgecs.net/documents/tazusozomutoxike.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607583fd59206---73562530511.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acff731a7b9---13916878233.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/j5frcric88r9gqisanj37oscq1/38692395802.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/49d22dde2b14285943adeccf7a8a61fe/47822579990.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/79mv88o5spopd5sk2dl3n9p6j0/nomusikugusole.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7cfb6c554---20975677103.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821cc3a3326.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/radufexutof.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2169359a8cde141c9edb754effd7b5e6/nokolidanupegav.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c66004e3c---581474432.pdfIn PDF document text
    • https://wita.lt/images/files/90106349878.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sebafopexibuwagobariko.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/9670984617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14472 5552 bytes
SHA-256: e00969d757b123cd427c24473d2c40fc659e59fb70c6dabaafa5f3fa0c843c8a
font_01_sfnt_off00015754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15754 12456 bytes
SHA-256: f8f516a2918fbc73d388d5ebf10cb42ba32ca12b1b489d0e96fe92fd4d5ac713

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