Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0bcbe24151c357…

MALICIOUS

PDF

88.7 KB Created: 2021-06-25 21:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ae45c5e027bdf9516759c34e9c8c5e7 SHA-1: a5a8fa1707de69b1bfeb4efe86e3e0ef5d65d47d SHA-256: ca0bcbe24151c357482fcee03217d5745ef4abb2dd5a6012a6568afd72972d46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=cosmos+possible+worlds
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b09ba0aff---15259590260.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0e751816666eedac856cd73319273dbd/82567002594.pdf
    • http://eksan-ltd.com/userfiles/file/4681069049.pdf
    • http://classicalgardenornaments.com/uplds/file/rezugemudodu.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/h5in6a7rl5f4it0r181st7igqk/zabalivarulumizer.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/59d73c26e27b47c514b6b90f87938484/lopexu.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kgpveb5e5a9i2a7u9ukrgdt2c0/31969102457.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b99823e093e---76179027858.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/fa9917a895142fd6014f52dcceb600a0/58302437720.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/13a6cpdeh0imgolhbqvefe9t63/lomodakas.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/elp95bor75gq4j36enkjo3s6jg/67608478975.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa5819921---12670101185.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/40053042356.pdf
    • http://rurisnet.org/images/file/sawemuwikuvameb.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/126910cb8a84e5446b403dbcdfe6e649/kojukopavixuxepofezajo.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c86c3912---kimipapikinifiz.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/i4tohhf2o3s7f7f06oap7ilpcf/ratabo.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60c48aac9---xapubesepimimogamuvubut.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/r9ag4f22b8vncb7orognumva1i/lezixanuboxu.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608547a2aaeaa---84361897379.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1c992850---wiximawefusukapekit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f540.bin
c1e272da403287907ca38a39be0c4e33cbc7e7b93e52e42a63eb4e246f2ce3d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 18772 bytes
font_01_sfnt_off0001251c.bin
d0263ea68ca03454eee47b7e979f90f5cdb294ace73baf0d56bc7a4fa2020048
pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 10448 bytes
font_02_sfnt_off00013c8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 16792 bytes