Malicious PDF — malware analysis report

Static analysis result for SHA-256 8635c477f0477030…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 00:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6dd22ce94d3f768780f456cfc493d9be SHA-1: 53e0246df514a49fb351bc4a7442e6a43d128d72 SHA-256: 8635c477f0477030d1d54cd0265dd28dfd56a7562832a961c1771f2129de3f16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with multiple URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a845c9788c9e04e7f8cf1c547abb0a22/kezuwuxe.pdf In PDF document text
    • http://serramentisiciliano.it/userfiles/files/52270078756.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/95718404081.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/47812119724.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/mudezuxisu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/11sttudupboej66e7l41hilt9s/83569913030.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612b235f42617---warutikasewo.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/57505537378.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ag6uv9bdlgpri3ocjleilv1l6n/77046648386.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/getekinebabowujewevusukub.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/62046711318.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae582730c---47194131873.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/9041455577.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8fb8f25554251cad766e9a0379bb68b6/bupigovilepet.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/51876788311.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/rujadusaxe.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/98570424267.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/fejijudafamivo.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/5582075689.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c086ad06afe---biliruxonuwuxesutitelo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f2d0ad8c---wujib.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/mufopamuwuzaredutotebif.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/kisusoposepu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tivizukuxuf.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a52d560d---15820264540.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/lazalubipegefajem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=godrej+and+boyce+interview+questions+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_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 17808 bytes
SHA-256: 3085492979e53aa5c7bf31960c558c4c3d602b4363f6ebb0af5b5fd4cc19c8b3
font_01_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 11388 bytes
SHA-256: ef15df5723c28b0436e592b5e69b887124578fc06e7233348fd1d201406c531f

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