Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe5103746aee9a6…

MALICIOUS

PDF

77.4 KB Created: 2021-06-17 05:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c30a0b90db87082c0c88d1654e66b881 SHA-1: 85b373918e1cc25da69b371dcb235a11c3ed2339 SHA-256: cbe5103746aee9a608484bd0bb56bd41446879529e647bf7cf7c3ddf3cc659e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The embedded URLs and the ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=recover+file+after+factory+reset+android PDF link annotation
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/69fd7b82ea7c08301680709296479be9/61588072497.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/ruviragugikiguv.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3e87c1421efe9c071e572395d8f1fbcd/12796978197.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca2d558f1---kixebaxegilo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b182323c10b---kazute.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/widokamigozuwito.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tlmg2ltk7hp86rgopcl8ugd4h4/kadepab.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/69458583244.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m4bt6jdf1cegbfkqjfis4obd86/61620505211.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c04239466e6---tonutobarez.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/74486323973.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/mabenorad.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/46219673889.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abcad866339---jizezazugeborudadi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5963c66dc9---woxifexenixuxipog.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 5184 bytes
SHA-256: ac3fedfb575f44694ea478a7dde5698c49e6461737ca5eafe4aa217185de28f0
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 10676 bytes
SHA-256: ca2431f5460f81ed8cb5ed35b727d9459f4717b4f9f08a1fae1e125f5672e138

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