Malicious PDF — malware analysis report

Static analysis result for SHA-256 936f39d0c2259bfd…

MALICIOUS

PDF

78.2 KB Created: 2021-06-28 15:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e592361c5b6b62646991102da2ce8b1b SHA-1: c909d839906563387f7198ea16d60e4d47995092 SHA-256: 936f39d0c2259bfd09190b6f357c68d123283222ed8fc12c310cd4752e2280c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=compress+photo+to+100kb
    • http://slsnn.ru/content/files/47518021571.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/wojexi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pvs7bat1bpscrlgfb6p4er2pi1/xewotigukita.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f6aebc356---nodigaxisu.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092626df1c89---kovuxadanifesuv.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b101a00132b---gobaler.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/20b68e525bae2cdc5d9e5ca19fd8841f/71796242257.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1f05e606---jadazokonunage.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afc764723cd8f4fd5ca065be810be1e5/82276990552.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd7c13285---59363936001.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b59124b29a8---pelogewuvot.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bm9doce934148i4njvt0oiojbt/82071455239.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6874fa51e0---85050066225.pdf
    • https://actorconseil.com/files/file/kesesozura.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ef2ea769e53a02cba0b56652e4a1d207/samimezetozamiwerukuli.pdf
    • http://www.knickmeier.net/images/pageimg/file/megikunaru.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b5212d56---97454033879.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/r90vgr7juucht4ffvvh8n938dj/niwobiz.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/dc086f7e7b3c0bd25b163ede3448185b/76573557593.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16221743175134.pdf
    • https://inifd.london/uploads/file/fodabafa.pdf
    • https://amrapalispot.com/userfiles/file/4746793343.pdf
    • http://gialtour.it/themes/userfiles//files/24673764928.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/40ce4f9bee38dfb4ef4829d3a081c7d3/wopogumedogagazurugukab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d068.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 16792 bytes
font_01_sfnt_off0000e87a.bin
75210cd58a83d3810a62f24131a330da2b7ff811cc94cccbb9538201fb74a113
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 16680 bytes
font_02_sfnt_off000113f3.bin
2262dc68b594865bb9dc70caed472b7e6313e94fcd0f939ae9dcb766482b975e
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F3 10548 bytes