Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21dc04257ecb40d…

MALICIOUS

PDF

95.5 KB Created: 2021-07-02 23:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80af62c99853cc33a2bda78246cb9d38 SHA-1: 29b41ff75d0c59da0b4d7712ed9601f112403338 SHA-256: f21dc04257ecb40ded9086141626d6ebe32a7a46f98b718713609d8bd4b37993
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to external, potentially malicious, content via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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
  • 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://mzr-avocats.com/buddha/ckfinder/userfiles/files/sefifixetezudifukor.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/libalusanul.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/guzasaremuduteboxapuz.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/bojigokutujigeda.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1aa0dafc4c09f274b50bf202a2eb703e/37941115682.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/88106468616.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/76660752886.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/464a61f121249308e4255309d5acd675/mugexozatowunili.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089755a8ec6c---49561527309.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/dafemotizusifonufezuzi.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/xomizuz.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/37960432128.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3fa5927ce86a9f5f6aace68d8da21c31/gutuvizalujulazutulofa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c113c3ce---58744191722.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/91764066046.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a47556717fe---basofuparakiz.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a53ba63f0c8---gawoxusemo.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/69294391670.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/bitukadipemotosovabi.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/23505660681.pdfIn PDF document text
    • http://krzeptowski.pl/file/fomenukesevejeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=adc+dryer+commercial+troubleshootingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 18016 bytes
SHA-256: 77c89498eeac340862c43899c939cc8a317d80f58d076131c69b44e97d83dd55
font_01_sfnt_off00013f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 11152 bytes
SHA-256: f9256cd2e834370dca1ca3a660ac527c9b50dc3f4e02885c7408053bdd27f496
font_02_sfnt_off000158fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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