Malicious PDF — malware analysis report

Static analysis result for SHA-256 863e71d28dd79eb9…

MALICIOUS

PDF

87.8 KB Created: 2021-08-02 14:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52163466fee3c0e573c8b7ebcf1bc7cf SHA-1: 0c270164afe2ddec4fc1a8112a396b55c08fbc20 SHA-256: 863e71d28dd79eb93884a43c1831fbccbb6fc7c5f3fced4f8dc1bd303c033286
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=everstart+plus+smart+battery+charger+with+start+aid+manual PDF link annotation
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/697baa9a8c80d48a25076f420693a4d6/2516390575.pdfIn PDF document text
    • http://capital96.com/userfiles/file/moxaxezoxuparagogugejevo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/22184725163.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/wurozalerexolokonavon.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/duzupubenizivipupudejavil.pdfIn PDF document text
    • http://zubrcup.by/files/files/dikonotujiluje.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/91902571536.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607578847241d---62898509443.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/titi03f9cn6h4k1scig4e3kjo2/duperiruduvid.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xuwalirokoja.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/vtou6fhpq2ic4in7j7uspfelfk/30798029094.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610258a602dc7---38643951072.pdfIn PDF document text
    • https://cristalensi.com/public/File/28701590490.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/zumefofejilu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607721a641555---memegalurisunabaraxax.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21de5247d---gelikemajotesinuzopalak.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/nosedenogelewenulexaku.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50100814e5bd747e3d52a641c2e2b515/62579772603.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/78280222743.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/99735679657.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ac43799c66201867aef050cc84bb4544/ragomimadanesam.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1385396262.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/wizisawubiwowunotuzo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4f09ac42---fanefojazaruputowur.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e68063579e19cf3635c9cbed5bdb2b69/65925393979.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1697281075---dojilusunoturoxukanokef.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_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 11332 bytes
SHA-256: 4250fd69796f590b961981f9641c654671676daea545c4b5cae061f76423c617
font_01_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 16856 bytes
SHA-256: 3af24a07c61d66080cea7b4653656a496254272dda1b0fea9b3ef850c4a30eb7