Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbca01542af4777…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 00:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f92ad44dc6b0c990292ccb4f2150b480 SHA-1: a70d27d6413e40d7e72313bde9105e48155b571f SHA-256: 4dbca01542af4777caec9d853bfd595d63c22c2fb4e7bbbefef956e0f8359136
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a PDF containing a link farm, with multiple heuristics indicating it points to compromised CMS upload storage and disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were directly extracted, the nature of the links and the detection indicate the PDF is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4503

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://www.agcontraincendios.es/ckfinder/userfiles/files/ranotafusigadut.pdf In PDF document text
    • http://cuacuongiare.vn/upload/files/11710351757.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/79317834660.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/gaxodubamamemazenoxi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/783dda76221b4c9827dcbdd8d070c406/xolivupatexavokivabe.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134297f4e2d8---nurowakojakopaxenebor.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905144909.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136048d5c140---4022193751.pdfIn PDF document text
    • https://tcremich.lu/files/files/43320268504.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/78186556376.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135226a3acfe---65153019905.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/vixakigaxarorejopukobulos.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/gaxudamatemubifimu.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/20830509573.pdfIn PDF document text
    • https://rajaunited.com/contents/files/polexunaj.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/30396120746.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/30985088204.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/mizitedowafidu.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/65971516774.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/27204039813.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/muxuxa.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/23847983950.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0ed7ffe475fdf3bb2a5c57f623d44c59/92019486979.pdfIn PDF document text
    • https://blogsma.com/files/xenutibenuzitalevoduw.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/sidofibanusekijuxanod.pdfIn PDF document text
    • http://crm333.com/documentos/file/gasowodalaziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+new+big+boss+moviePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 10404 bytes
SHA-256: 7515ab53244dd1ea8206a97ba85b59ec0cda84f77bb1abebeed0dab7adb2af8a