Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4f3cd9ab61ead3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 16:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 545ed21e7627383de1d899048a817878 SHA-1: 1b44f9ab3282e6f1c868dfcfbed2f2345776424f SHA-256: 6b4f3cd9ab61ead3e263e05e989d92b64ec6acd0c1d07b2142363918fd8a38f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures to phishing sites or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160761099c9ad2---pefamikogofonitawome.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160750233484b0---sukaxelufosivux.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1fc9e9b9bc4e72492e555fcd1cc4d17a/82698056194.pdf
    • http://kme-kme.cz/files/file/tepipibiluxule.pdf
    • http://donghocasiochinhhang.net/uploads/userfiles/file/35265924197.pdf
    • http://clinicaveterinariamontecchia.com/userfiles/files/22346341447.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c173f8cc71a972aa70dc3d908ca67e97/82716247637.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/68066117880.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a4d0e30b---lafatipibujilemobedof.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7fdb3eb84a885dcb531a791974090c9b/woxowosov.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe22a22832---63829203139.pdf
    • https://gea99.com/ckfinder/userfiles/files/vaxirerow.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084138587321---77456488077.pdf
    • https://tsegypt.com/file/dupetamowegoxegojevibin.pdf
    • https://pmms-online.com/assets/file/vigisonifeguzonov.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/61414ce92c509eb49126b0ef66c5f01d/88340959822.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a17817931---99478253543.pdf
    • https://chungangroup.com/uploads/files/202108232205432458.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/s6ceqj9uahmu9ps1joivv02ski/11279916708.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c78840f36d---gasepanasazik.pdf
    • http://www.smpnuenen.nl/images/files/xanelapetinizaxepago.pdf
    • http://elfobchod.cz/foto/Image/file/85303545618.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/visedukadekuxosowix.pdf
    • http://canxetaidientu.com/images/file/93662205943.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/zudusovimumite.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/3681343660.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=que+es+distrofia+muscular+de+duchenne+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbeb.bin
ca9ab07fa5a412cd48696cab36fd2189965e547ea8cf7df4094355bdf35e594f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 11044 bytes
font_01_sfnt_off0000d582.bin
356da02e5627d2738893491c7a77c7dda4640512187eff8552b6aaec628c1c00
pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 16108 bytes
font_02_sfnt_off0000fe0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 16792 bytes