Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce58903070eeb18…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 01:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e0794eec1399ab9c92fb6c5d5ed1a0a SHA-1: 32eba63372b191e2d34e00d19c16ce71313780df SHA-256: 4ce58903070eeb182853b8460b16c1e2391c1bbc2545d8bf5cb6f6446fdaafe3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of these links indicates a likely attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=red+discoloration+on+lower+legs PDF link annotation
    • https://szelvedojavitasmiskolc.hu/files/files/mebiwowetenofonoxesadem.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161194e67e6de8---venutofop.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/raselorenaga.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/01294bc5e8bdf099077d7b35d4e5196b/96630847830.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/5198746448.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210617035745.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcd705fbf---617705817.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/91057080840.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca5e9fd99---bulukunowoxeg.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/82947587631.pdfIn PDF document text
    • https://nicosiacaffe.it/file/11724113134.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/52585955189.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760b283053---polenozebogi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072054eecca5---49022586742.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/88223326331.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/76524005125.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609683fd4813f---jonusurogoboxoke.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c5d54e92031c836fa0cc2ac363de27d8/16364840211.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/savulexixutifepegasaliv.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/dino21v2vv9r0fuctvafhqfjq3/pirego.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/gadazoravilasaniwiwuwunow.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/davidumatikoxajogelinafo.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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 17796 bytes
SHA-256: b3ea457dc03704c8bf670172171c9b13a4f4880b89a18969d10419ec2e7e6fdc
font_01_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 10676 bytes
SHA-256: 5e3eb3b9449e7d91f7efe393b4ecdf479b3217edb3b0d5e5a043c724a83b14d9
font_02_sfnt_off00013e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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