Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca525bd05454706…

MALICIOUS

PDF

79.4 KB Created: 2021-06-25 14:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a434b804ae1c8b1671eae7e1463c8c28 SHA-1: 27b3023599cd9349e59cb24954ce6f8d720de00d SHA-256: 9ca525bd05454706d2db91cadcc983ac6d273a305298a5c47a19d2d70f6519bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URI heuristics further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bhk-aindling.com/userfiles/files/xusarotemepekoxase.pdf In PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/raruxokukavuledida.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/47957515985.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee4651f70f---86056161002.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/65914968875.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/zumeta.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/deparukokupuda.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c977ed68---11206048712.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/215f12f58e957bab4b1b68b4a56b177a/77183940093.pdfIn PDF document text
    • https://activepymes.com/pub/file/xipowivigupirefugodisig.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/fivosubudipupejakeb.pdfIn PDF document text
    • https://kristinanamaste.eu/files/44317064780.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/27173713990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=5+parts+of+the+spinePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/47a9af905126acd648caed0f9fc1e318/33296990984.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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 10448 bytes
SHA-256: f22f892f5a2c8bca68f3698222fdb7294d97ce7028f7bfd46eadf9c5a71b7ded
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 16140 bytes
SHA-256: b65aba1f8389f79c947b6798a7150786aa8550c8137e346b02423e81a3e45d69
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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