Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb7b4df7135171f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 07:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99fc874c4c5d4d190af2127df21fb6d6 SHA-1: 47eb221f7a779423939877952e3117219a88be8b SHA-256: 7eb7b4df7135171fd4e2ccafb7312e22d567aef4572b4b2a3ef90978c82c9c38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=ender%27s+game+pdf PDF link annotation
    • http://immobilier-valence-agen.com/userfiles/file/17660472217.pdfIn PDF document text
    • http://webursitet.org/Files/file/56024005464.pdfIn PDF document text
    • http://didopack.com/files/51781356021.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ccf34d7931e929ca6116d42c2f9971ce/37445069102.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/joritipitomimaxifabukeg.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2a7a88edde01f895b20ce94e285fdba9/nigukisinu.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jijujurenarizurif.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/61013821487.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/35864139327.pdfIn PDF document text
    • http://kahasat.cz/data/file/vigematabo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dadimotetum.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b45b82ee8c---peligarafusavo.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/nopulesajixekalugaz.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/zobogawofodejikugog.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/palizi.pdfIn PDF document text
    • https://lazerom.pro/media/file/89901459033.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/vizemoxidomusufo.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/zixezenabukalurukaj.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/vaviful.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pokasus.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/78005808154.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/91831470656.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/24530890952.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_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 17708 bytes
SHA-256: 5c67510d2030ac365bc701f46ecc94607c25149e4a311e3f56fce442475904c0
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 10504 bytes
SHA-256: ff5ae6e7253e9b6f845f9d0968702d570a4050eeac72efad371259e9892fba6d
font_02_sfnt_off000128b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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