Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6dc1cbfd024de89…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 22:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 767c7c4a73c1d1d01a4e026a39adbe12 SHA-1: 7d41a8b7a5b00ee7330102974f5e710ebea868cd SHA-256: e6dc1cbfd024de89ff263ab0d020d25c540e2a24401f84cad5fa65e8b660a9f0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://seerupit.dk/assens/file/dazeriwo.pdf In PDF document text
    • https://samoinstitute.mn/uploads/assets/file/kolilubijonunoru.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/48700359188.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/mujiz.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/jevanosezagebozugozewuv.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/43824898771.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/62919772832.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/57792962934.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/saxokanerosifeweferi.pdfIn PDF document text
    • http://allycatering.com/userfiles/wobirarekejiz.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/34977480222.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/polirazorufinapat.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc86403196---rujozaxomanoluro.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/detafewuwi.pdfIn PDF document text
    • http://school15-tyumen.ru/f/fufowawenoserubuno.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/48559722670.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/runazafapujafinufebemudep.pdfIn PDF document text
    • https://ebooksweb.net/files/file/rujagevonab.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/90387189150.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/91766950083.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sjgvvpcpudj05gdonrd7q1k47n/remaxexuvaxatojiwi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/55214396641.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/440229b7a4940d47c9bfb6c2cea6e559/12883691350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=texecom+veritas+alarm+manualPDF 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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 10620 bytes
SHA-256: 6d4d40f623bcce24f424137bf4451449154ad6a09dd97c0442fd449d70fa8292
font_01_sfnt_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 16616 bytes
SHA-256: 8296af4f4ad90e149492d25cd4bdcfb7726ffbc776ead3a0468df8e49f99ed68
font_02_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1