Malicious PDF — malware analysis report

Static analysis result for SHA-256 f804d46368f0e4c0…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 03:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1dd49aa3716bb1b4a9796ced25d9b9a3 SHA-1: cafb02d30d4469480c06f92b410af58ebdbd8330 SHA-256: f804d46368f0e4c05e3dcdc7b665c5ce62283f53f902c868fd2cc00dd6c74575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates an attempt to obscure the true destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=tipping+the+velvet+pdf+ebook PDF link annotation
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b5beea90e---demaletewufirafudatopedu.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/losena.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/2345239905.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/92809468635.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/kigurel.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/887d8af95a4d99ee57a981dae8f9de58/vibojosa.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8e22aef614917816d899bb04ff9830f/96453727031.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/6604147522.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/46954913465.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c897cbd9a6f---subekirolavedinawomox.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca723b6a40---90114623163.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/durizixoviwazizegu.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/tigamaximosobijepo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072520bd9cf1---97783666070.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c00730a3---82742345600.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/nugodofemesikefapawow.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e944b2204a6---gapibimil.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754143f3a75---973122324.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/59944549871.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/48490809408.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/divepela.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/medevuvapid.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_off0000bb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB96 16696 bytes
SHA-256: 3f5dcb0feef2cdc009fe991a256a1d507c143c54360566cc2522c77f6565b3f5
font_01_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 10608 bytes
SHA-256: 7c06c933dc35da06a76df202a40eaaa3b4cf22421d19a87a3dbb21b902f7a841

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