Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f039fbc3df7fb7d…

MALICIOUS

PDF

117.2 KB Created: 2021-08-12 19:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09ecee1363ac39e9e4b9f5591014fa1a SHA-1: aea0e634d06f92cc5f0b42d327d32547af81c88e SHA-256: 4f039fbc3df7fb7d141fe32c49a2b42dc6f7e5d716278a0fe5913b8f8f4f441d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of embedded URLs suggests an attempt to lure users to malicious sites, likely as part of a phishing campaign or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://musikpark-live.de/userfiles/file/11561888540.pdf In PDF document text
    • http://diamondsnspurs.com/clients/12200/File/wexakenula.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16092362cd3e8a---vatovobofejopovex.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d0861633d45215d04bf93a356d5a2200/wasijabalevafaxapalinunun.pdfIn PDF document text
    • https://noddy.nu/images/file/sesudukadejagapesuze.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/diwigudedusitivezojelixo.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/25737059784.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b78c06b9da82b8f59f403912521782b0/sobakevopofofa.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3d9bbe81419b8729cf2f25ecb54a6fd5/kivatovatazutijipugix.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f6c0f2c05---90476661959.pdfIn PDF document text
    • https://avflash.nl/upload/files/43389753613.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/v79qjv5bvgl86bfj0uu1ttqtr4/bulivewowukeniz.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/kogaropujarirupasivofolu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100672c2f880---2632979773.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16091991733500---43327277512.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc7e4f170---kajefekulugunupawupi.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/laduramotizebevukep.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/50ee711c10efdda1ec699133e4197c5c/zunig.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///36501898118.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/2068518430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=roba+como+un+artista+austin+kleon+pdf+descargar+gratisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001beb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEB0 11340 bytes
SHA-256: 231fed28bec1f80c4a361b5e537ab28e27a370dbcb6d9511343b4aa9c7371396

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