Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca90d0604f8d54c…

MALICIOUS

PDF

96.9 KB Created: 2021-09-09 00:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77d9dc544b5bd861141a8edff8a47186 SHA-1: 25094dfd99d287e629df484e85a28d90b48cae68 SHA-256: 0ca90d0604f8d54cb5e1194942c5b294b5e55a7ebf27c81b7b5c2facbc7e219f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads. The embedded URLs, while varied, point towards a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

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
font_01_sfnt_off00012fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 17696 bytes
SHA-256: c56769072c67fe0e6bbc3b35ac85c0d2e1fd12a4732e882daec3d7c7398b430f
font_02_sfnt_off00015db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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