Malicious PDF — malware analysis report

Static analysis result for SHA-256 46aab014fc52e93e…

MALICIOUS

PDF

90.1 KB Created: 2021-09-08 11:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e363e0113b812d0de30d2ece7acffb53 SHA-1: 031bae8e7f9d9a72fe92d1dd9bf710a1c3517c66 SHA-256: 46aab014fc52e93ed297b3dc1695537974a13e5a1ab0e81b85239c2b99ad1512
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=introductory+mathematics+algebra+and+analysis+pdf+download PDF link annotation
    • https://fallsplat.se/file/gunuba.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/83619323790.pdfIn PDF document text
    • http://ridendo.cz/files/file/22044635450.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/divuko.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afa3e7a98f---jabavit.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/xigakamukoxenireposukuru.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/2594854330.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/wudubu.pdfIn PDF document text
    • http://zamgph.com/uploads/file/151007465883.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xiwiwokusuwixokudilux.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/19068654954.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/45738715178.pdfIn PDF document text
    • http://4rrecycle.com/files/file/42512694980.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/vegoxaletokametulukuxase.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/vukawofepesesibeg.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/zexojajotazarojeza.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/75335708079.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/47791598382.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/r5f8vn4u1kf6emctmpphsir1g3/57622967035.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c6ca47f2a44e531e25b1195c038f37fb/nedoxifidufikekuse.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c17bec22---zoxixogexew.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/15046035776.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/47893689439.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/gorixugoboxowopesu.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/60780919613.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_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 17688 bytes
SHA-256: edf17a8095f142a0bcf05e82dd0ab82f14a2f7a6793e89f42be5f0020de55a79
font_01_sfnt_off000126fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 11456 bytes
SHA-256: 0f89b3d8df6b1f71a824cd5a8bc91df4cf2e8ce241249040c6b2b005da654f28
font_02_sfnt_off00014186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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