Malicious PDF — malware analysis report

Static analysis result for SHA-256 4617f0d885c99aa8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 02:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87eb6abc83aff05b008fef97a03cf1aa SHA-1: fd58e12cdedb70b28039431ae1c3c195dbaaef37 SHA-256: 4617f0d885c99aa8fe15555f010d0c7e6a7e4ae559066510f508cfb1d31b3bce
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 detecting it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://crewmak.ru/uplcv?utm_term=contextualization+and+localization+pdf PDF link annotation
    • http://chrisdepanneservices.fr/Sites/cds/files/fakabemimoxak.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/56533931064.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/pasovifitimi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f000a92e26---2841812916.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085028a8d353---finisa.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/42053554788.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611025e93c963---koxekuxesefif.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03a87cd722---63297836805.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/30277699970.pdfIn PDF document text
    • http://alvitraders.com/files/56843292751.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/10574604848.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/siwutaxerizorilitik.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe78b49dae---7408728505.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa21fcb6a15---13543694408.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/10895637396.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/15c158b983b5e05f1ff88375cd4d1f0b/pemipiwixekelalol.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/tamonoragoseperis.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/meraxunawunijadomede.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/muzelajazorejedi.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/85541227175.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/20332221620.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/zadadisaseperepetigepupo.pdfIn PDF document text
    • https://energooptima.hu/upload/File/judepobata.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/65102719525.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/guripakofu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a057134e---tajopigiloxulunevubadasup.pdfIn PDF document text
    • 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_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 10636 bytes
SHA-256: 08deb23817aa56d56d7739ab06a1cb0ec46032b6631e468118f765d010880c8c
font_02_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 16996 bytes
SHA-256: 43771e5b7bcee28154f509437165e18fe3d2af9b3c848b408a7e497467c360d3

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