Malicious PDF — malware analysis report

Static analysis result for SHA-256 549a3f7abcd6e515…

MALICIOUS

PDF

63.7 KB Created: 2021-06-08 18:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b716f04d7cd0917ba45c0ca2ce13d1c3 SHA-1: 46455f550325d59cfebc7ef8162ecbb8706d8b70 SHA-256: 549a3f7abcd6e5156c86c2202ec8e472c44c6e0961010252f43ff9dd13447afa
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9111

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://krisoc.ru/uplcv?utm_term=future+tenses+exercise+pdf PDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a19fdddb359af807d8ec09a03d2a7eee/22781848797.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bfa11479---kujafixubibatanubulataweb.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/51968745808.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ace6c05198---48769329129.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815862ef7cb---50141418020.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j90r9m34g7nbvkhc5ggomg5a21/80025504966.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a4aa484b458f1ac0aa3cc12af38cddf0/22750276136.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b42236e7---midivoxurusaxijewagikuk.pdfIn PDF document text
    • http://expresskaliski.info/file/62533376565.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/90665216402.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1fda76c88---97933087938.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160728321c515b---78309185292.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3677355e3---58750282438.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/83a0eec11c86a5321f23da9fa60db4b8/wevoti.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3dqnfrphvqnqnc2m163qnhpfc7/lanitazar.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_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 4928 bytes
SHA-256: a2d7a7cc728f533fdfaf32dce03d6dde4737b0f1ff3c27dcd92ad57cde74e614
font_01_sfnt_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 10312 bytes
SHA-256: 70ffc599166b25c18c7e6e4b63a9955a2b3f4cdbfd59181bebe35b460d120f95

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