Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3344e6ca45ee09…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 09:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e851413412c106ca22de06c664e9ae84 SHA-1: 88acb7052af4bd29de991b0157ffef6bed99d55a SHA-256: 3b3344e6ca45ee09879a8d759b50979248e0619932b16ce2743c561a9784c480
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The presence of compromised CMS upload links further suggests a tactic to host or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=olive+oil+anointing+bible PDF link annotation
    • http://pozitron-s.ru/userfiles/file/pivurunasegizabupebevapur.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c05dfbbe---pogafoxi.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/333cc40b8209237c28a33e634950acc4/89422936300.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/djtcrqik289q7kg41911i3eapk/99895957618.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/41042341413.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/75559442881.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/nijosubexozajewafa.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/vozevifizogu.pdfIn PDF document text
    • http://df-foundry.net/d/files/lagef.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/tobuziwunetekowuwefoxeg.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/wovet.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/wonolinolileterukajudava.pdfIn PDF document text
    • https://andana.us/files/files/97748681391.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073305bd9672---kadoratasefim.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0888d897---5971734510.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1e0e572754fcf5ef9c978495f91a07e7/jisetuwi.pdfIn PDF document text
    • http://gro-felix.si/uploads/1350489151.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/74367259906.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/15001756242.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gvlqtaa5pf0655nu6ek5ldl1b0/kasotisikeb.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088603506e69---20642551872.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/tijuvim.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/90191617834.pdfIn PDF document text
    • 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_off0000c7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D1 18332 bytes
SHA-256: 81f2eccf60cfe343b3bba1015cb4078091fa2b50843876d9265f09a069fa0605
font_01_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 10244 bytes
SHA-256: 69ac7e02d8f70e5347a3483da69b117f61a067d7a7c4b797364998c2c0c12fdb
font_02_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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