Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dbefea90fbb578…

MALICIOUS

PDF

73.8 KB Created: 2021-06-10 15:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dc6dc80908960308762ea559e9eb682 SHA-1: 54f865bfda0e51c0bf7ee9495f0f3437a48ea38f SHA-256: f4dbefea90fbb578ccc07d27f1221f57c30bb40efcf3187493a70743b7c2c864
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

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://coretry.ru/uplcv?utm_term=7+2+practice+similar+polygons
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca01eea88a---14044117027.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/cuuq5h0n3qj2t1fme9cc5sjhnk/balumupadotigapizo.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26721b3d3---zejiva.pdf
    • http://tofuyatogo.com/uploads/files/72564105933.pdf
    • http://aaaexpressac.com/userfiles/file/vivexin.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64f6cce5e---38566660903.pdf
    • http://flygarfield.net/userfiles/file/banaturuvumope.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/19f705c434729a044a75792793704cf7/putepabukokuluxabepazo.pdf
    • http://lungshingcentre.com/userfiles/94398814968.pdf
    • http://travelshops.pl/userfiles/file/56205968600.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8ht5puva9m5vo7c4koo3fbsjp5/14661531709.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ff134cc866119775ab00eb97b46beb0/vibojezujesorize.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0808722c6---kiwamanonegigowem.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r0q2r549tsqai6mm2bocfc14nj/72903642559.pdf
    • https://jdlpartnerss.com/userfiles/file/sopezojuvekalemagifebugew.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160815e66a1049---rufower.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
    • 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_off0000cd1d.bin
be1618eb23c81a2d8062ff6786e154e587a644fef3baa4cb602ee3bdc2416c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 5472 bytes
font_01_sfnt_off0000dfb6.bin
b3ff6ee73d75ba1ddd3cf56eb97edeae09036ad7b409c62a1fffe3fa3c5a3d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 10816 bytes
font_02_sfnt_off000104d3.bin
062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 16072 bytes

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