Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ea0fa58cf15fa6…

MALICIOUS

PDF

98.0 KB Created: 2021-07-22 01:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55ecc68053798f234298534cbda018ef SHA-1: a85bd005cdfe6766b5d8b2ac01627c6d8809f752 SHA-256: b8ea0fa58cf15fa666239a499a85dcc93b508e6e1b582cd47ae28fe2a582efe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The primary attack pattern observed is the use of a link farm to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9d415e66---mizubodul.pdf In PDF document text
    • http://bhttourist.com/upload/fckimagesfile/dukefa.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/11247806417.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bdaed5ea---18187204984.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/jafaradedew.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc61a28736---71551948683.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/bunadulobubujowunam.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/gavonolag.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/77094207651.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608441ff07c8f---nejovakofur.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6b6c900a---dizilopali.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc24a96d9b4---lovixosumis.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jolebajebuvenagetasirudam.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/daroniwoxepunijajuxofi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/868a0fa27e1e4e8c5eaaa15974ddfb49/73858780465.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/bajilimaxetofo.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/rirusuwidutafudo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e1eeab8bc---dolebisirimajuzuwi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/634f918f89a622504164fe9a45cd729a/zurusimuzoxuwivagasijeba.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/94510648910.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/21214869253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=synonyms+words+20PDF 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_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 10396 bytes
SHA-256: 1517c37f6326495587aaff3eb0eed8100aa2a5be206e3b7e5714f8559e3dc837
font_01_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 17432 bytes
SHA-256: d964b41d04a7c1ecf75604462caa1d18d3f9479d837b25f0cdcb92b9974f698d
font_02_sfnt_off000161d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.