Malicious PDF — malware analysis report

Static analysis result for SHA-256 1027ff6fcf7950e3…

MALICIOUS

PDF

124.0 KB Created: 2021-07-24 09:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a628590b6c985b43061a57866d6c6b20 SHA-1: 3d108cc521efb8b00ca93c22d5a7bc2d48060aff SHA-256: 1027ff6fcf7950e32e53d9d379eaa04beea03d6a1c45b1dfd2d76265736625fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/81875217816.pdf In PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/35922207367.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dca1f8f8de---dojimuriwoxazupigofuj.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777131c85d9---15880047564.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/04a760d09cd106b056b6b69a287dcf09/muvimof.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/dodunobujagevakufegoju.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/bomuzivek.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/25572352393.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b206f9d39a7---83639116560.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b842022c13b67a509b3bb9bc7f86bfe6/giwuze.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195fe75367---27077020144.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc1cb070ba---purelupax.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/25938725484.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/zogevozakaketiruxa.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/zuledejekejuset.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/95122571134.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/4783078142.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/21779943692.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/futuwudeselusoguwutu.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/tixutuxomumut.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/jilumoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=vida+y+obra+de+aristoteles+pdfPDF 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_off000180c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000198e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198E0 10612 bytes
SHA-256: 573fb3190ebf856d3a8b33d234c1d9d71c0a3c94a8fcc1e50babdc7405e93297
font_02_sfnt_off0001b10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B10E 18440 bytes
SHA-256: dae6849ab07355b8823736f4716d141fb9e30125c5b4f82b4f634fcd28c6aa15

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