Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83cb970f90e4581…

MALICIOUS

PDF

89.0 KB Created: 2021-07-07 15:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0316bba89564745e1dc0297742c6f821 SHA-1: 60bead43eb9712cbab11b27e51ba68d4c3430552 SHA-256: f83cb970f90e4581d74a1e15ba611da369d73dd220a3377a6adaf0a04f744443
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and link farms indicates an attempt to direct users away from the document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://smidgel.ru/uplcv?utm_term=resident+evil+7+banned+footage
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c864e19f875---31934353987.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f475f8465f5b412276cd07355a7d26d4/jewexasiba.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/95575083284.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9d263d2eb929ef3a0f3994213c4925fc/64189693725.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607636970145f---37021657372.pdf
    • https://petala.gr/userfiles/file/jisaguroranubakadu.pdf
    • http://ttccid.com/userfiles/files/golakarig.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/909d9c57875f71b8b18e7c3e35de50e4/xujopabewubokiponimewaji.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a48ccca88da---48578336399.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4b0ef2db---putewageburodukejuk.pdf
    • https://aimara-bg.com/userfiles/file/39976547745.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc1cb36b2---bebobep.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/mokuzawegagewasonovip.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d0592b427dc---tekugoranixipo.pdf
    • http://springbook.no/files/bezimisoto.pdf
    • http://joyearland.com/ckfinder/userfiles/files/sudulumozemate.pdf
    • http://fittbike.hu/files/file/gunaduben.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c855180a897---79155912965.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uqtr7bkdfp0fje8oqmmj3as3rt/zuxodeves.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/12701312206.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/c8d9ad0e18c76892612e5a18392b74cc/35992089221.pdf
    • http://infunplastic.com/d/files/zupopajaza.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071891a095de---29816081408.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e852.bin
38220cd8ebf6edc825fb8c9e6720a6aac16919369d045e0a49145f63765aa432
pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 3004 bytes
font_01_sfnt_off0000f4b2.bin
94d377700710f468525cb5a0e521cfaf5d067649791cf4bff8bb55608b86c1b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 10728 bytes
font_02_sfnt_off00010d5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 16792 bytes
font_03_sfnt_off0001256c.bin
24daec269078f7f6402c0224d8ace8152dbe21529ef6e64614423ee593a4d1c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 19572 bytes