Malicious PDF — malware analysis report

Static analysis result for SHA-256 4371e60f180fa850…

MALICIOUS

PDF

87.5 KB Created: 2021-10-15 21:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dddf26257b84214446394a961a6da48f SHA-1: 5d567292a57b80915eed136903ed5f4ae7040142 SHA-256: 4371e60f180fa8501bfa5779c9295ecaac1efe2d79d50d65562d595d06b87824
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 WordPress sites or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fcraregistration.com/UploadedData/file/lamarexogut.pdf In PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/fifafokomegot.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/51058263776.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/tazapusinimerizavuxalor.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/noxuneriligagof.pdfIn PDF document text
    • http://test-immo.com/file/lofinidosezexosojal.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155e0ab4581a---japedawimulogogizine.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/81962592123.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/kisilojinetus.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161666503a808a---70648588391.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/242902611.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/78166606383.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/43137187256.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/supedaterujatovizodo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c61e4592d3---vexuv.pdfIn PDF document text
    • http://dsraxys.com/uploads/16464861504.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/47788247600.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161697f1ecf591---molerobipuwujijaviloxe.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/85544469017.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/wiwimezidenotiviripumi.pdfIn PDF document text
    • http://keitbg.com/images/files/nibifi.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/gokezavefoxitavavuk.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vimoputojowe.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420e11e529d---41722816555.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=stickman+master+league+of+shadowPDF 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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 24524 bytes
SHA-256: 81e2f3e3ac9d23f8832d49ab9790e6c4600a9ecd9a59df9011d92ae929eedd6f
font_01_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 11276 bytes
SHA-256: 13c825dc48d184e5b1608845436a15d7eab91fd028f103d0ffa432b70af8257b
font_02_sfnt_off000137ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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