Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bd55bc8fe253a7…

MALICIOUS

PDF

79.0 KB Created: 2021-06-22 23:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5938ceb26beae5e130d176482ae510e8 SHA-1: 38feb75cc0be613a7c021a8eb651a1751ee9cee5 SHA-256: 77bd55bc8fe253a74996ad893bf582f651342f2de88ffd3f9a11ca9ddf5f11bd
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely attempting to trick users into visiting malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://cructi.ru/uplcv?utm_term=class+7+perimeter+and+area+solutions PDF link annotation
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2caec3d19---72205878487.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160779b95b3339---bofozexagobeto.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/49623927062.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c8cdf04d2b8ee4f1569d33ebcb79cccc/sadenelofaseran.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2b34b09040cb9bbaa93d398155e026d3/59826614778.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/oa09u8o97big6kbvddodedc1fp/nufolixutamazeji.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609100e8080b0---kowigolujuledabosobuxiwo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091883ee0ae8---lelobamibewikaxozibox.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0b71e170c---majutovipise.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df13cdbb7b---gimuganelanigofaliwuf.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/kimasupufojafalijadute.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be52714d2---womosaw.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/feketarupibutamumoxugiz.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/32221794152.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vupokugidijutosogu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241f16aa4a---33457432135.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 5088 bytes
SHA-256: bfa36fae75d694c26d3dd5e31f485a16e9da5d05bfb7c8a1285f31b4f41dd29a
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 12312 bytes
SHA-256: f9815ad4164c73c55c3d4771d072673c87a98e2f779e0cf6a2650c3f6659f731
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 16288 bytes
SHA-256: 5a49c6429274235a56f423a2eff9c541ca3f37e9da419c1cab5e43788ec81cb1

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