Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bfc974a6696cfb…

MALICIOUS

PDF

76.2 KB Created: 2021-06-20 02:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64fc7e57bafe1e13b47def49adf40e7d SHA-1: d1d7e4d9087e554c38702c93e8e5b0b73a8486ff SHA-256: 77bfc974a6696cfb322ac205cc1cdb8a108cd19ba1134374e2bfdbc22b4f6d2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a game search query, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=skyrim+how+to+get+to+bleak+falls+barrow
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/24539106115.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0865d89d830c6e1010d8b36cd2fc7fab/39562743877.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nn4ltuef66l7c0r9bncnjsnpg0/10285682456.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/904466c57a0415549e123eddd1085a1e/2285972474.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/o2liimtjn3il0cav9n6rcslrj1/39899086086.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb259636bb---dudozarofibejizubejedurem.pdf
    • http://dermalab.pl/userfiles/file/lidererulapirusupuxak.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcefcd09a---46993449278.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/37ff178d80b216da4763ca10ac1cb8e1/sopaloxerikewudusukepak.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160809368344fd---62678297431.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/953a4e9e77a72c6fb65b0f46ea6fff24/92246394538.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d4f17252---57724479399.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d2127001---fasaponokadud.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/kme3et1hutjnggpgui61fuauda/gebubix.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d9f3867f---62751085168.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e085.bin
df39240dd004907ffbb8c5b7ac3f252655226ee859678f258c981e503ea4ec42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 5684 bytes
font_01_sfnt_off0000f3d0.bin
86a43f07f0a1e874f79e8a3c7faa9f942a8e551570336af12bb88fdd47007b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 14772 bytes

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