Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c490e72f5081ff…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 10:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4f9fa3b298a824941b8473e443efd1c1 SHA-1: 16e111e16e60d17b6025cd5b0565d1bde0dac7fe SHA-256: 94c490e72f5081fff6b8a79aaa7ddde51269b916fed51dfc2baee8a39daea2b8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content or phishing attempts. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/44fdce5b88ea517366c54576dbc58440/menetozetoxezefuned.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085be97867f5---27998249050.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/n0h106dtfsoh8jh05k7a064227/87615897285.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda6714f86---vugosegivaxuzexalu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/90927542909.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23fe7b612---11286183479.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9a43756ef89965bf69c47f4f2fd07c71/jobot.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pujidepewivoxanazivebawo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094121bd2bff---75237480564.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3hk66ssv97750duv1su9mr3v33/bisosabimokusinefegezol.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b95e765b1a62ea1dcf3a6b94225a9cca/19681904635.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/walil.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15385689e4---mujinisetemoxirapevu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef191d2f2---rovutekuxina.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ed2220b32e4f11ccd2df51534af41a1f/zexowajoxekivijeful.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/lerorixugara.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/976e6e658772c48af53db24354959fda/papokutezilamiwasupax.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e679a1d9---22560770486.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a202d2121a3---4717216730.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210607132333_t9e6wk.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e933e90e0---95162398958.pdfIn PDF document text
    • http://megalaserasia.com/upload///5528237869.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f1721c019---xigixogewivobe.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcff35d74a3---nolafadefegejatavolufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=thermoelectric+power+generation+pptPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 10700 bytes
SHA-256: 815503e3ecae27aa4eb076e2b563dc8e98d5ebc52c0958c75f8b8d97f7be7813
font_02_sfnt_off00012df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 16564 bytes
SHA-256: eb0bb9359aaae74af61826e67829e9422a257d23f095519435cc1b2e58d4d428

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