Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba139c91293e4c0…

MALICIOUS

PDF

72.1 KB Created: 2021-08-18 20:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f96c9cea3fa714664fadae930328480 SHA-1: 7a5703fcda32008b06b57177a9dec8a836e2a0c6 SHA-256: 0ba139c91293e4c0f3e8aa1fabd45d44058c7194fe3b638607add8a20b41b0db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites. This suggests the document is designed to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/67c50300af58f1e66c2dc89bd7334be5/27021794260.pdf In PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/veguridalulati.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4f1794857d64dce57d9dc4a241d3e97b/bijunemonakewewozolajaji.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe8c61f6ce---78913686013.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f81a235c---ditamexeniwabof.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/69003179287.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/fusadekuwujilutalalerufi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ct25pjddmroc00314qhqbr7tfu/54537170657.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8626ae25a3ce3fc56e71f72e4fe48703/jujamivuduzox.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/jawesujofuputowu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a704e10e08f---tudugowoxaburix.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c93d4c33f782d818b318011946daa009/31658276271.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/60877108942.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099821f95e13.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/35481471559.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/62977969147.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab24af97f66---16404261115.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/16923949577.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ec0b9761e---68995348234.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/13037638898.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ff7c15e8b0b76e5ee00a8f9cab8f7a74/legimomusuzixoxejisamut.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e437688710---jolabudavutifupa.pdfIn PDF document text
    • http://flexa.cz/docs/file/4751101067.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/84717391525.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/gigonen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=como+saber+o+meu+orixaPDF 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_off0000b7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DA 17132 bytes
SHA-256: e1e468ffadfb2b33a58d70e56f7836d88d662356d7f2f4a99213fab574ca20ab
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10392 bytes
SHA-256: 976c6c46360d5b6bf14c3217eebf5e3a9dda0f6540a7b8cb3135efaa3324b827
font_02_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1