Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf38e9027797b82d…

MALICIOUS

PDF

89.6 KB Created: 2021-07-03 20:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2fa07771c4a02ae34b083bf5d729a04d SHA-1: 5dde939eee9d552544c367223d35db76b9c859fd SHA-256: bf38e9027797b82deeb26cc4355e2f8e08e0d380d8202e5ec91c6d934b1047e8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as redirects to phishing pages or malware download sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to use SEO tactics for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a9f40089---fogijadulalodideruko.pdf In PDF document text
    • https://nadamasristorante.it/file/80012552619.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760305a834a---zanibojubinisafasonewiwum.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fvprkl33uj57m4jb8gril6sml/ruxazuwisedataser.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97741773540.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/satt2j9jpmeshbqi11hlv061r0/97382605613.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/ligobipujemavu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///bosix.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/41ee3e65678fcb92767b20411d9143cf/merobijux.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/53515168138.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/janotarelu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0da9b9d86d7afcf9c0395526b892a5a2/raxotawedafiperipif.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/84003266295.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d30e837d7---lazutadi.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/xazugubufa.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/648eacb12ebabdb79fd682f1e14bc822/giloxij.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac36123f6---busawujawenagef.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/pdnej7u2o4vhub7461jkngdgi6/77293408001.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/094c3313101c3e3c41667c19ab209654/70807022685.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755ad242e52---ravom.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4711e960---kowafizokaru.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/83116202012.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/40729873470.pdfIn PDF document text
    • https://ikima.fr/uploads/file/tebowegit.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/2130029022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bradford+protocol+96+well+platePDF 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_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 18040 bytes
SHA-256: bb74a47de255b8696adafe574f643e6356d4cdeafacc33c83a699b5e7ae84776
font_02_sfnt_off0001403d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403D 10724 bytes
SHA-256: f17578adbc98d495ea28edbba2fd65026bdcb7256d257e8f921adbbcca6bcede

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