Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ea614075f44f9e…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 07:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50b4a21b9e8b641d4edf63dbef1e534d SHA-1: f8dcf93152324d5548e31b100aaa6b2465cb8ae4 SHA-256: 19ea614075f44f9e619495b104b98f896c53cd68c240b2240aadceefde5d0d13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to compromised WordPress sites and other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=read+the+hammer+of+thor+pdf PDF link annotation
    • http://perilatomsk.ru/ckfinder/userfiles/files/gipojowowabuvuga.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/42018381698.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e26omfqbki2k9ieuqager7nrs1/41984632501.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/jewebagerekegopi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0p81m7ad3ftlc1c03i9fajvnth/3594285165.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/tibowumitikobobojevakefe.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/22df74f620251a0db2ccc73d45ef848f/25558547112.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/laketanunesijefuxopuk.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/wivepafebixubepewa.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5386c380a737956f51bfa6fb5d0da1ff/59131061494.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096b27e65672---kugifuzekufijixux.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb04d5e007---77003540754.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/8732039719.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9892eb035---79459518950.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/vulikoga.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/rifafufuzimorarugadoxazaf.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mnc0gog478u3068ku7ha9ejq1k/fulovezaku.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0141659096---nogibakede.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/eb5uiv2tmvlvibf477l52h0r16/pifosokug.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/wafarekirebi.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0130445001619955986.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621242210.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/22299159446.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_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 19172 bytes
SHA-256: 4347b3eaa53a113b6e619ace27ca48215ff6195d4b425f6503a7163c93aefb59
font_02_sfnt_off00015209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15209 10396 bytes
SHA-256: 674a98917b7979e4739e5995bf1b483d8debfd53e96259d2d528a64ee74be4ee