Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3fddf38fb69066…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 07:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c7a08c9702e9817a44499ec5911c4fa SHA-1: dbaf64a19c2e139839cae1885a941c1aa26da1fe SHA-256: eb3fddf38fb69066b04b91bd6921015caaf69a2ec7da81480697665b957945d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document's structure as a link farm suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=sten+gun+manual+pdf PDF link annotation
    • http://gioiacompany.net/images/upload/file/60969205526.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ca49ef54ctckce5ujjknaedv2r/9813492522.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/joporigurarifazaguson.pdfIn PDF document text
    • http://esejsc.com/upload/files/xegavejo.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/sorutelapijezoxan.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/69368311119.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/66878550457.pdfIn PDF document text
    • http://orem.mn/uploads/files/xiditinowo.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052003555273499.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/tuwuva.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54e788e76---53211581015.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/26246970751.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35b7c4cc41---walananugulix.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/zubexotepovojef.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ndka20ogvr9vftsn6a8a01fr2g/tomesamusimim.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/waduwid.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202108131135013039.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/26441426310.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/27345975082.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/87905919730.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/1473226671.pdfIn PDF document text
    • http://kelvista.lt/images/files/63214329228.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45718744b---xegakuwaberasunurorubul.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_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 10536 bytes
SHA-256: 8b58002671e1f432c5ea91bc04e58c2ca4bca54418b5b9eaaed4fe9358faa710
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 15348 bytes
SHA-256: d607ed6a91d71f03b186e341d0a997469354729ac8e71bb70356e1fca946b0cd