Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c15393b3080f38…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 08:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c5eb7cd8ec81d5cc930bc39776e4d82 SHA-1: 7e9c2be9d54964b54f6b534dc7132be867317b33 SHA-256: 21c15393b3080f38c37b6c96c9e6c12bbebcbbf5ab59446e21b85e5c4bd8c014
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to potentially compromised WordPress sites, indicating an attempt to host and distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6121dc18---mujidu.pdf In PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/55643839102.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wawaluge.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xiragegusoweponola.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607371e9a9aee---gidibobunaxujuzananozi.pdfIn PDF document text
    • http://iltorg.ru/upload/file/buruviwari.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/matusivoleganiges.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160837ae223ca2---kosumiwufedi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/s7e87cdfk9sic0o7alfrf9n536/6903953984.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/9a8bad77bd269b97c693d4f089cb64ac/vedik.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737cd3d9527---80032618243.pdfIn PDF document text
    • https://coevent.ru/upload/files/27701884664.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/bozimit.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/79544438755.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/povafefuvumejik.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/72505136002.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/guduxofuloso.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/81065885106.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vebigajafuzukaniboribajox.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/gikodotativit.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/40050215808.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/somapejizoxopumunawefu.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jimolakorowodibip.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/vajifa.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/691f75a7d9c3f399fffab467a97b54a6/92665862575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=brs+histology+pdf+freePDF 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_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 10680 bytes
SHA-256: e8cfcf302a3544a84bbd43c685a4048552958f56041787dbdd1e6bad0ec1d1e2
font_01_sfnt_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 18540 bytes
SHA-256: 276083f4a49b66167bf01814af36bc5850dcb2d899a5c18e206619a53f80a8d9
font_02_sfnt_off00013f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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