Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6183a5c04a443f3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 06:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f73519402aa3d963f5d4796bc02451b SHA-1: 553185b38b318e9890f8a28039ba59e4341b2a37 SHA-256: d6183a5c04a443f34f20a658a33c0f5a898b069e8f82947306aac29192137848
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cgl.lu/userfiles/files/timukadosumuwatuzuko.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/128199f4fe0c32d66b6b02a4e087cf2d/mizurigelosidifetopuzevo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdae85522---werobugasedoto.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/33729397263.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/badakeraboxilofunap.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/zuvinex.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b525ebe3---70690118205.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/lozum.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/36509232933.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/43437637826.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e518e812---633001209.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/10121693216.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/povafasozupazosabiz.pdfIn PDF document text
    • http://brlairport.com/images/file/jafopixikate.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/xilobivipukixosa.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/41917450701.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8c264dda---kurogun.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/11892896501.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/tomobirutofuku.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b7023c6b4f368732d4f351ff8cddea32/buzuji.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d901275dd3---lilesawa.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608abefce9a3c---47371882117.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/pejoxofiv.pdfIn PDF document text
    • http://coumert.com/images/file/felexuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=perforated+ulcer+treatment+pdfPDF 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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 10624 bytes
SHA-256: c183e96eee81078179fa7a5ff06b340278b5e717893d93ea6f3c2bd7de7fd0a5
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 16860 bytes
SHA-256: 4b6898e35146dee7ea19d6a29c5afb67f52c0d731435ce0dc986ed9ae55da2cb
font_02_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.