Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbca94e7c7e99e2c…

MALICIOUS

PDF

73.4 KB Created: 2021-06-03 18:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01ddb02567b4366a992475e154538cc9 SHA-1: 264c0ad7b3c123ff6599cb199215e20dda298750 SHA-256: cbca94e7c7e99e2cdf6a9bb0ee88c1addbb76adc02a0aa33c487b056becb4a1f
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to search engine optimization or social media engagement, aligning with a lure for a scam or phishing campaign.

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://ketchas.ru/uplcv?utm_term=how+can+i+increase+my+tiktok+followers
    • http://onlineexpert.in/userfiles/file/60482780625.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r9hb29cufmjjdhi7tonp5onji2/damozajowesi.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bf05bfae6d7b1a5d727dd62834034cb9/sevixokosijuto.pdf
    • http://arcomproltd.com/userfiles/file/faruwewumumuxategew.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d8dba8bc---39510827291.pdf
    • https://btegypt.comfile/lajukiluvanarenonakurog.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8f170c7f3dd18b51a3a375992f62e339/pudamefogawini.pdf
    • http://brlairport.com/images/file/nolegoxekuxika.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2de2577348581d835a98b02c8cac7cfd/siluvazuboreweju.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/259f473a31316bf4d52744e8c47773af/22485638146.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160944b3284a54---85726828105.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/tmet6t3g4dvv0mhvlg7a08a0eh/17582920202.pdf
    • http://greece-ex.com/images/blog//file/64213267398.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b6fa59eeba2e4dc35885754790029860/15237471274.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160864f6ed3bca---25271914386.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a49dbc26a2b4dc34f2247c1a58a3a208/20991509276.pdf
    • http://stardentalcare.org/userfiles/file/wisizavutego.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_off0000e211.bin
ccef4c14b7e1275481fb0e6930d3cd983ea6c0851fc06afdec3bee380b68ccd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 5248 bytes
font_01_sfnt_off0000f3ed.bin
3ccba65a1a11c953f5dccaef1923b92e99d925610bade6b522eeee313a318348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 10732 bytes

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