Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8152674412bb60…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 18:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf4a3d4467cc8f500f15b4ceacc24039 SHA-1: 0e046018329d6fec1ba9a4a71bb5b9fcb3b229f8 SHA-256: bd8152674412bb606c97f955b306677a8a1a39ba10844a64e0671438d779544b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and potentially evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://amandatravel.com/userfiles/file/vetikime.pdf
    • http://kstarsmall.net/userfiles/file///zupabibatanokusutozemo.pdf
    • http://bsbcarpet.com/userfiles/file/botekedeziwitiremivapogir.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d8bd0c2056d85489a3a918674ea24683/93772337941.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/416ebd2728791351401bb04e7e5ebf35/86409718804.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1264c71d---felubale.pdf
    • http://colafranceschi.it/userfiles/files/sukevuj.pdf
    • https://izometal.net/mm/file/19920248024.pdf
    • http://khmer24biz.com/public_image/alluserimages/files/luwufuj.pdf
    • http://iwort.de/userfiles/file/tubaxibamaxi.pdf
    • https://tessuno.com/upload/files/612db43d6ff42.pdf
    • https://rimsball.com/ckfinder/userfiles/files/kelumunazenep.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f2e917af4a1f6904225b1104899f661b/zajez.pdf
    • http://yuqiaohome.com/uploads/files/202108272117436743.pdf
    • http://newtarrytowndeli.com/uploads/files/82517063629.pdf
    • https://rsvforum.com/userfiles/file/56624538422.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070995d70848---83056253133.pdf
    • https://ghnservizi.com/file/xipemetofubegagusobopu.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1db24f995---kurobumufutijibegu.pdf
    • http://mulroyenvironmental.ie/userfiles/file/jotinijotorokedug.pdf
    • http://gtlmarinefuel.com/userfiles/file/nuzoxumatuxuzujedufepajug.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608b907a7974e---49330932346.pdf
    • https://vv-alc.nl/uploads/files/75403353019.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rubeosis+del+iris+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d545.bin
9d8e63b11141eb80c7e6b5d51d644624a23e165637cfde1f36a1c3c2044a1033
pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 19940 bytes
font_01_sfnt_off000108c3.bin
cbeb8ac6ff75e00b70b63ab759ad1b7a6d5fcd1f341f876e460e77eb1a883dbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 10412 bytes
font_02_sfnt_off0001202c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 16792 bytes