Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e74d8d6912f6da…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 06:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 713bd78e12b2d4daf54ff5aa7061df70 SHA-1: 75e0e82fca95426065b872c8298c212de417f050 SHA-256: 55e74d8d6912f6da1c341911eda5f43cbe3caf29e628880812f2a95e8ea6f0fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://dailitara.lt/bites/uploads/file/91395983948.pdf In PDF document text
    • http://panel2conso.com/userfiles/file/mabafumemurufifixe.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368899f2172---47901418573.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/xogifivebixamemulif.pdfIn PDF document text
    • http://plise.org/userfiles/file/juborapijimef.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/66294520021.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/sugojagafugu.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/bokixod.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/20943165421.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3d24c087ea4a9a0dfcb61b0f27d06eb2/2725493394.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a2b31a4c1b54dc692e04a2a2d7847a0d/xonesibuge.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowepadimusoxujifabe.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/11461145051.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161373670990cf---valenotunimajelafitiki.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/malowutixewapazajo.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/65727069604.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6d0acb1f---worugugidikelusikidanir.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/68255946568.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/51001758173.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/zekitupudid.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/kewobigejav.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/48741939441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=watch+greys+anatomy+season+17+episode+7+online+freePDF link annotation
    • 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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 11276 bytes
SHA-256: 7b292c66ff2fc0cc3a844d715e28bbd7157655cd0304986a73e17f0d4ae26b89
font_01_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 18060 bytes
SHA-256: b8bd7733bfd2e6d16c8fd92e8c1a48fbbb510b73d4607179f272e5d4eb013158
font_02_sfnt_off00012ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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