Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13086a9f053da15…

MALICIOUS

PDF

84.0 KB Created: 2021-08-25 00:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 764c2f360385fbbb22037e4639ec1e4d SHA-1: 4e4d4e412b003c66b25d3736d08396d2d62bddab SHA-256: c13086a9f053da1544a1000e4054e63ccc4c1c2026bff259fc307c9e9df2308a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm hosted on compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://truhlarstvisollner.cz/data/file/libexibuvegefotur.pdf In PDF document text
    • http://artside.org/data/temp/file/25596346551.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/sibom.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/18209111427.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/xedos.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/2416706282.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/81773133981.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210714115926.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/tadarilojufagakejanojugi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/29938596594.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/sexinixirurowatux.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/sezizilejosufofiwolum.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/23912360786.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/tixavakisije.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c970d31324---63391024198.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/47080960012.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/gazojejatozepofegudaka.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/830d57397f0aee8d7ec14583aada8d71/rovibepojez.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/36542365330.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/netajanixaga.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/3k5gf3gi4i9htjat7huibnt2o2/61566643450.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/udh0i9gg1jl6ad1sb3ra083uv0/rixazubazogofasubofigalax.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd90e587a3d---luvujar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a185357964f---57877404415.pdfIn PDF document text
    • https://parkettworld.com/upload/files/mixovixivaxebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sophie+and+pete+goggleboxPDF 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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 16508 bytes
SHA-256: 129216a51a6074e2e4860ce99f8d7a7f27fcb84f39c2ecc860a66c0125ec766c
font_01_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 10720 bytes
SHA-256: 8e734ec75aed562fe6838ec59f169cef818ad071a52fca4c8986004cb4b7bf4b