Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3145ab2c08a5b02…

MALICIOUS

PDF

77.5 KB Created: 2021-06-07 20:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cb18f25761f40359df34065da165655d SHA-1: c305f51a561163b745d41639310a507aee9df71c SHA-256: b3145ab2c08a5b02a091d339fa07d48bc551e4b8556e04b2ca93b8eef487ab25
154 Risk Score

Malware Insights

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

The PDF contains numerous links to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The presence of 'Pdf.Phishing.Trojan' detection by ClamAV and ML classification further supports its malicious nature. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

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://synerhu.ru/uplcv?utm_term=replication+transcription+and+translation+thinking+questions+worksheet+answers PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3bb207bf1---1122044175.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d2015861---28788591943.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/25c0121968a0b1e2ac039a6f497f5206/sopowadufejelojinog.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609444d71ac28---moborebilexawakoxegujibo.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/tt9kt3jejj8gefpssaakfheug2/35793260055.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/luwazimisixofowev.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607123c3b4ef6---63765597857.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c9e250c6---90512216740.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82e2a7f74---35229018872.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8fe7871e---58134833793.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b206d62fda77be9435faa8eaab357116/27916953680.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5326d1fbab3936f3c40efb368e708850/19770351953.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/18225721239.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085beded2829---famavutoxenap.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/54250916045.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 5624 bytes
SHA-256: c9bc4507912be01825f3c818af0522d32c7247a5f38edf403d27b1be06d6bacb

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