Malicious PDF — malware analysis report

Static analysis result for SHA-256 586477c8dd3e7eb4…

MALICIOUS

PDF

93.7 KB Created: 2021-09-14 12:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a28660d607843000919f42b7ee6a837 SHA-1: d6eea1995c9b7c66f4f670f57a5e2c13dd5194dc SHA-256: 586477c8dd3e7eb4a0ac0818c59be38f7e62dc7ebc266d60caf3633dca25c5a7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3931

Heuristics 5

  • 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
  • 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=chess+tactics+for+students+by+john+bain PDF link annotation
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/joxepopu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8da0075b---77775861585.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/52746207376.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/029ed0797bd0200a13c87f968728d109/wufoxaloremilafi.pdfIn PDF document text
    • https://aashianarealty.com/file/dowexolaluvipumapitigen.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///nemalelezor.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/dewebosu.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210914170954_s3y5m5.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/xenimefogujolamipaz.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/87819278693.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/16722502948.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/49596034461.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135f783dd700---mujubesal.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/rekin.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309e92be574---38552038445.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210903_9590AD53E8BF33C5.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/zuxuwapubamux.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161385fa553d62---58961277591.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/76184070763.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eff109bd2---pusuwogiwozemu.pdfIn PDF document text
    • http://rinsacars.com/files/others/29787730349.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13684 20592 bytes
SHA-256: 94e1ec0e46f2d61942d6778e1800ce1779c0f936b152adbbfc2001d3620197c6

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