Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9425d525b3f516…

MALICIOUS

PDF

82.6 KB Created: 2021-05-29 02:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80298dc6d1f6b690b9772fdce83e4017 SHA-1: 374a8079580aaf62ce6e7afd13aaf2d29cda58ce SHA-256: 5f9425d525b3f5161ef73603f60e91a47895fc4054f050d757fe7f5b8143bd64
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8297

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=libro+el+conde+de+montecristo+resumen
    • http://afgventuregroup.com/cfiles/file/85834001429.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7cea6c95b47830dd2412285933b8e84b/pisuraji.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607559b07d502---xudowuniwagafiwino.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160708802450fd---nafanuropi.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/imcvbcqqbp8a4599djkd6p02u4/39837422165.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079247297000---75182930530.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/b52719d0c9904f7ce0887e2780fc9688/ripaponiroguxokejitibito.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c3efc0320dfe0cc2fc4e53a0f4d17783/fuzobaj.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7e86ilsh2v97rfl8khm80219nt/dojajurezolubuf.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/99d31915f0f5925e7fa69fa9a73fe887/84558070177.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099e705ca692---koradibapajonorikapofub.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b07bd8b20---14416169525.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f53f7317f---naronosaguzolaw.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609919be15f9b---74369988441.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/69lg8bcs4q0t3507jp2sal677g/42684379041.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/worakamoduke.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b287e8271---wixepozis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d5c.bin
107fc97583226ba2297875abd446d2fd2fdec99daa07782a46047a12ee9e87bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 4840 bytes

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