Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c8cca9fd09ed85…

MALICIOUS

PDF

91.5 KB Created: 2021-07-03 06:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23cadad502bdb50b96984a166d81c47f SHA-1: 37a127043244d276b1b90d4a9121a8dc8029ac4c SHA-256: c7c8cca9fd09ed85300b9e6809694c9615e55d16b6dfba3c5a4c5eeae6966ac7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The embedded URLs suggest an attempt to lure users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f7242cf339e7fa30bd50f17e997b69dc/zefigiviwuweda.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/54247103095.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160891ac36d998---76881866588.pdf
    • http://immobilieninvestors.eu/userfiles/file/65080457838.pdf
    • https://ietc-oman.com/userfiles/files/73720890047.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af184eb9fb0---8811683405.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c489e9c85a9---togitelerolud.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/xosukegumozerubixed.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0dfe0b0d0615ae8db2de1ef7753e70ad/sigekeboxagin.pdf
    • https://igruppe.no/ckfinder/userfiles//files/32672623122.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/rq8lfa78lr1g5kkljcr0n3j1fa/biboxis.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/37e6cc2d63f7d6cd8d615461a0716423/96307486400.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/2d9aa391fd49ab123cad97561f001a37/90463672070.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080622742f---gimanasiguweluvupanadop.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/50450940262.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607749210a3bb---wulunelatopizosubinujit.pdf
    • https://powermailer.in/userfiles/file/55493276729.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/gikpvvuuh0uu6420sinm7inaio/75868063330.pdf
    • http://jtour.vn/userfiles/file/ribaxujotunewexaravebukup.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16b5c3a6b2---duvali.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160706c9674c1d---4362439955.pdf
    • http://ecogestval.com/userfiles/file/nakimo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=character+external+conflict
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed34.bin
4602efdc27effd6d0b9796dd62a14020f6514d216ceac1da6ee579af8a0da4e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 16208 bytes
font_01_sfnt_off000102fa.bin
537089c64c6a2bcbc0545de57d0b8c28c36681819e80fec2e015106477968b7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 10396 bytes
font_02_sfnt_off00011a7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
font_03_sfnt_off0001328d.bin
d7611d2e2f8d9520e0c5890a72e5bd87af826a9ade0c7ad7032ee733d7a33035
pdf-font-stream PDF embedded font (sfnt) at offset 0x1328D 17472 bytes