Malicious PDF — malware analysis report

Static analysis result for SHA-256 367cff4e82f8a919…

MALICIOUS

PDF

101.6 KB Created: 2021-08-08 21:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f5ba36d7387741f328804bd1186cb57 SHA-1: efe075250c414c82a2bcb4ffe894354b78eccf30 SHA-256: 367cff4e82f8a9193ba3d3ebd7b9577e11cc0e790fb8532b0ad769055897b649
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosting further PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the hosted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4qedlkv8rbet984fqmfo992ac2/likeviwikewizixusenev.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/336d21e0e24c09ea10150d59c4b53de9/26029634960.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/joxepidopozuwefuwakisomef.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/39179765239.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/29ecd8616da499b3940aa1d2ee1a61ef/86065662749.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbfb978731---xosiwatodosidepojizuzi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5877c0aa0---dinemota.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/23b80c39210e44b93af38609b1fc61c2/6397871989.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acb866c8b29---mepuzop.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/46783531947.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/mepamozebalibewe.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/zomebexifa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qhk9qq44opnimjep7h91af3ig1/nawejirivadurubu.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/tewubexemutiniwuwo.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/6821234922.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210603_C2E2346EE5F27376.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/lfg3q1gf603pacvaqag7nub9n4/ramabexumibi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9sm5bn46badg3cn714utbp59an/batotimixol.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd84a1f422---giroropinosivijufis.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/87317238455.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1e3d9f45---beworoja.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/o4ahdr3uevch1likt4f1d0kgo3/pupizimoriwuganiji.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bcade77a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cfa+level+2+curriculum+changes+2020+wileyPDF 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_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 23992 bytes
SHA-256: 9ac03fa3de85473e6fb65ee07c830f8da5708b8b3bb6a7ad9924282adba2ad8c
font_02_sfnt_off00016cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC0 11204 bytes
SHA-256: a0f785a9aa7feb171868690e05231e284832633baebc334c492ee93a27ca2fb1

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