Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa4cbd9597489cb…

MALICIOUS

PDF

83.1 KB Created: 2021-08-12 02:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 256424311a6cdae00e14e9b1df638f26 SHA-1: 1c57a9a7d405d1fce092c4d3f2a357e859d48701 SHA-256: 0aa4cbd9597489cbacfd6820dcfabe5c5c8e2dd876b5122b22085bf03dfefa35
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous links pointing to compromised WordPress upload directories suggests an attempt to host malicious files or redirect users to phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6244

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9bc08aab---narekozalurenabokijofumur.pdf In PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/88444158605.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/tipesexowenow.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609701deb3fba---juzolojipetino.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/sadunimozigom.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160741e4060d2b---77771179552.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gi64arjq7ug3g338nps6eqhf87/57064671446.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1b1ed783613143d7be4bad9c96d50ab5/52675504406.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c9fdb4676617f7c438b0e5d167a71f13/86599150656.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9f1c33f6b---42275585899.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/75503588616.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fab06912a35---muwakedapaj.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb4ee0399---52312961213.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/pifagirepa.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9a9407628397ec805761c33a18825084/mizaxujegetirow.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a6c7ccc09ff6693aae98bf37d2aef647/99573833965.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/32665757905.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7eabf88dc9cb501dceea859109d7070a/62545898917.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/widesuxolozegigo.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/xutam.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/katagifefajetogufo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160acd67928acd---79698720074.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87ccc96d8---loxifatesulixoworut.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b95eaa36beb2db7c772824f54a28bff3/75495691287.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/mupobekevezube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=japanese+to+english+translation+book+pdfPDF link annotation
    • 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_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 17156 bytes
SHA-256: 1198b9ee3ee1e93f1aaeb962bfe200d3ea85a6c8c3e823a7d8e2706fbfd1d124
font_01_sfnt_off00012dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCA 11000 bytes
SHA-256: 4d058ebaf8d406f723320efcbbe32f65f529c1da8a0603ad67b6bba316db052b