Malicious PDF — malware analysis report

Static analysis result for SHA-256 1083ffc266df7f69…

MALICIOUS

PDF

41.5 KB Created: 2021-09-21 09:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e92350f3e9d238263a9483f1cab28d9 SHA-1: 9934dfea825d8663b8f7a505c4566eff00cc4358 SHA-256: 1083ffc266df7f69d6033b5d0389e19d25db086e584f0c9b21377643e41cb2e8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple URLs pointing to potentially compromised or disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to host malicious payloads. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7113

Heuristics 6

  • 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.
  • 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 http://fu-xin.tw/uploads/files/202109130807184514.pdf In PDF document text
    • http://boilerservis.ru/uploads/files/jogasolerepenu.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/62871000709.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/xemapotolipoxuzerorij.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/47fd548204c463d43360c25c7ab41642/93692644723.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489e9827489---bitotibe.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/vebutamize.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/raroba.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/zutejik.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xomadinotoguvuxite.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/1187682729.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161493b474eb50---82546284110.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/fitixadoron.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/naforawu.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/58607901507.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/86699113497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+latest+songs+2020PDF link annotation

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