Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ae4c37afe37f34…

MALICIOUS

PDF

101.6 KB Created: 2021-08-02 08:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bebb92c9d5a2fecbf857c2309ec01e5 SHA-1: 060bd35247d37d2dcb39a2343ef7607881920de1 SHA-256: f4ae4c37afe37f3426ac371a84ff4052ea4c7a609c100c5741326e1f95ea26b3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URIs that form a link farm, pointing to various compromised websites and potentially malicious content. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=desierto+pelicula+completa+en+espa%C3%B1ol+latino+hd PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6fe86d7f---98577072698.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/7155581882.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/300a455920dae6052fec271656eb6352/deletokenexuva.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/lujiwadatagetuwe.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/nenuratilemasun.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea56d1ce99c6c7684afce484c776026b/tudunexisujasipemi.pdfIn PDF document text
    • http://bjallstar.com/upload/file/28251945248.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021060503054673499.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/jixunevisalij.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/hlb4ip95572btuli9tceusqf04/83613214226.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/82055748187.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/remijinozanije.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/534d6f542640ed9d6859bf39765dd617/guxupovuzurazibixagevino.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/hchhnuaqhf6re745j2tnls1ea7/wexonaraweki.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b5c68d98---dulesuxozulogufi.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/71273603953.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607be92d74664---9253415526.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/dewomadukajo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/nbtdhp12e65krvrcr0oegedp5n/muripivewokekibaz.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2169e5c01---razeboluwikiwesirimel.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed41b29882---91937931829.pdfPDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afd257a3fea---38405823288.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/piratis.pdfIn PDF document text
    • https://tavio.ru/files/file/kobufunarobiru.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/28206924368.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 16204 bytes
SHA-256: 8928b5f29bb91ff6fa419d8ebca9eab5d94a5781f474e55c8622188ad1e5a3dc
font_01_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 17828 bytes
SHA-256: 2e9864f96b8bd96359586f5df23becebb10609f6177e66e112aa373f3b61db04
font_02_sfnt_off000153a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBF 11084 bytes
SHA-256: 9960c4c021c3155c1d2eb8438be3953e1402b13d6b292fe62c4ae1389b007521

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