Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9ff15955083c8e…

MALICIOUS

PDF

82.9 KB Created: 2021-07-07 06:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 22d24108851f590f2df3d69c1dda8c3d SHA-1: fc19c3d4a928ce4da4c152ed90048a3eb843c694 SHA-256: 3b9ff15955083c8ef923851791b1cbb6ded84508a5e8b07c4a42809a7add17a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=define+scalar+and+vector+product+of+two+vectors PDF link annotation
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qa4ig2v7fhtafm9kbhhg80vjcn/rerurorukogasapiwinizep.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a9857217835894099addec929547cbde/vozotudi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3cfb74063d0a62aac824c6285b678ba/zuzomazutabomanoga.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/28030724894.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ivh5mocosdfhbv2k0afln4p974/13127188185.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a515c477b2---koliwazisinukinafelidepoz.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/10838941296.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/tdfku5i1vkjvnmldlveihevh1s/pusotijebitajumuzokilab.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4631143b4d8f6404625591f7904b9039/gidamalanalakutina.pdfIn PDF document text
    • http://paliukenas.lt/i/File/47778799416.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623390990.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pbu52oa1iu3caai1v4mshfirgd/rixuvoveresemudaxut.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/serujupukoses.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/zulufotazukoxo.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/64697080794.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a851f6eda15---zujebibit.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210508130733.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4db83638fc---vukokajuzarasodubukinife.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pagisomutudorige.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/3727398374.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4nubam0u5hhkomtuj2vislgu36/mupig.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/41216063120.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/228faaf55020699d0f58aa4bf70900e9/zanokupolanuwinodageza.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/nafoka.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_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 18256 bytes
SHA-256: 69f6d9a084408d5a13c352d1426707ced9e70ce96da7ce6769003dc248bac6ad
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 10864 bytes
SHA-256: 74b4e0dd596d8a6265339973a3dc53a9896d10e704b6eaac397c69aa430aa951

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