Malicious PDF — malware analysis report

Static analysis result for SHA-256 477b0a3a9deeea51…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 11:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0bac06743c652abddb10332395d5ecc SHA-1: 3ea4b43b9b51a859f5560be8e1a872fdf815290d SHA-256: 477b0a3a9deeea51f77e104419452393827785aff830175a839a4e3bf23a85cd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to lure users to malicious sites. The 'wkhtmltopdf' authoring application suggests it may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=x+plane+all+planes+unlocked+apk PDF link annotation
    • http://96rangjai.com/userfiles/file/gezipabanemubaripim.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/44441504676.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/vazililale.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210911_9324F4A32BED7CA0.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/34894522689.pdfIn PDF document text
    • http://htwy.com/upload/file/95232980293.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/wodovidosad.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7d4bf0f5---renurojunegitejujexo.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/kixodisigofejevubi.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/56584826748.pdfIn PDF document text
    • https://goodline.by/userfiles/file/dofabajigiluzudiv.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/33197795766.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/takezotopasiratulemuz.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/67167159578.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://unaizahic.com/Files/files/65500589740.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/66780039205.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/77753699077.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/kujopagufetijopotiter.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16133304db3741---dugufazofalalevu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380e50e8cc8---pijoxusipapomo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/03d2bec32f4e7e5662367ee65d49c172/baneburemodivevumukaludos.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/getukasub.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/52853131691.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/54024429061.pdfIn PDF document text
    • 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_off0000ba5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 15712 bytes
SHA-256: ee2bd229fd82552430b08d595699184b226b5e27a92eeb9a0824b5e30580046f
font_02_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 10416 bytes
SHA-256: bd86b2848fa2857727bf9a619740ea2adb5936c691c8a059774f18281925876c

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