Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe9d2e0a0a64161…

MALICIOUS

PDF

85.9 KB Created: 2021-07-15 18:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c8c02dc6747f516617222a4021b12de SHA-1: 2aef58f2244d0b41b1abeb44db9526133b28369e SHA-256: 5fe9d2e0a0a641616cb5d54fc1040486a3db6da04ec42244c6c53c6624a6e791
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, indicative of a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, and the document body was unreadable, but the heuristic firings and numerous URLs strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4217

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://actaviaserica.org/board/file/files/vekidexaturapixora.pdf In PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/91737385166.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/98b6ebbc60e28d54ef073c8f89518554/kovewufipevila.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/vesaxenebub.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/37658b5203013aa07a4bb425be399696/89257810294.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/tikimafe.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/kimetixipaboki.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7679efd2d1db3a7bb068e356d86572d8/32261120314.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/safarifemano.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9b6a46c5---nevovagivinafukorenogix.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/ramelo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4677b18b9---58427596208.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/db87c59e666775d6c0fb61c69e448d65/sexamovaso.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/iugcekb5aum0ltqehgnfgv7ol0/12044620020.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1a660c324---41065401256.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2b677b785---pajopinibix.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/vulix.pdfIn PDF document text
    • https://castel.ro/userfiles/file/33124747742.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/lalarikofob.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/gojegu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091bea136066---3266078900.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/13845310386.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/abac6cf09ae8a8d885529af329658c12/18701562683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=liquor+and+energy+drinksPDF link annotation
    • 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_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 10688 bytes
SHA-256: c42e5fa5a0f5bf1d342b1fb3d8c2a4695ecad921917784af8b9debab130626ee
font_01_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 17252 bytes
SHA-256: cc9a988e6e00a01e44601d30d410aa8e1104cbee1becd5100a870fae9c64e145
font_02_sfnt_off00014456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1