Malicious PDF — malware analysis report

Static analysis result for SHA-256 9393a51f330fe3f7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 15:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 843642fe59eac7880ee5396285478c1f SHA-1: c117c8a972b180f08069bea544ed42b741157a98 SHA-256: 9393a51f330fe3f7aca94793876d9553e94c6861de7712bdc70ca2ff2e0d481b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress upload directories, suggesting an attempt to obscure the true destination or leverage trusted infrastructure. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of using disposable hosting for redirection, likely to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088de99c1ef5---3154363353.pdf In PDF document text
    • http://parfumkin.ru/files/files/44451401698.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/pezewutiwi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baf6ce4423e---36669713447.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/fbe504a4a7f042dd1573ab0a50761261/roreg.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/wobegawekojaferuja.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/860e45b6da49426b2d6ad82c165de842/pibaj.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a80135438b5c755d142e8743eb099e97/58602724067.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wavuseferemekijuto.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/81252114536.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/wepizofokaxeno.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kitazemitiwanukupawani.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/folinolexokinije.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/36932486346.pdfIn PDF document text
    • http://hotechike.com/files/files/pekawosewidel.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/k2lb1qckuv2ba5a6fcg2p5gbod/lezemapupikagobulisuw.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/ridegekoradoxizoj.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160780e8dbcc4c---memipudedamer.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd4b6c473---55547013544.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/xefazebikukijudafor.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/7764342638.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/golumobafumivosi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/154eq9q662fjjb4trmud7as6gp/70034125200.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7dfd9b0d---95113650707.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/81162989545.pdfIn PDF document text
    • https://nadamasristorante.it/file/83737311140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=auriculares+sennheiser+rs+120+manualPDF 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_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 10652 bytes
SHA-256: ccd4b530308c8b23b28afbc6188121cf9a2ff9bd2751866fd5315353d01ae0a0
font_01_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 16276 bytes
SHA-256: c19dd27d2fecb5154314d7b87f383fef645c9164d048f51d419144f33f3b5d71
font_02_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1