Malicious PDF — malware analysis report

Static analysis result for SHA-256 c506179a82e9ac63…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 00:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0e3c378919f4a97ff005c637c335b53 SHA-1: a68eb687274dc8ae45eb7543ab49d1ebfe72c99e SHA-256: c506179a82e9ac63a55f2a643b4c80bea369041a2d3710f8bac25d5bcb964008
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://infrive.ru/uplcv?utm_term=tamil+mobile+movies+online
    • https://nwdglobal.com/ckfinder/userfiles/files/fatawisakegu.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/acb70683a682607a926218ee5fda1ec4/wipos.pdf
    • https://stotex.rs/files/74147379005.pdf
    • http://erbamedica.org/userfiles/files/jajodoj.pdf
    • http://joesservicecenternj.com/userfiles/files/42642371984.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/jupexozudofogutufagidujod.pdf
    • http://elitacasa.it/images/file/6638032858.pdf
    • http://bienbao.net/uploads/files/sorerinirusevo.pdf
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/48347066455.pdf
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/30653965673.pdf
    • http://sanzmendia.com/userfiles/files/dijiwufuxumisazeneb.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317fe69bc3e---79613627488.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/zabepeti.pdf
    • http://doktor-okonski.pl/uploadimg/file/89157890038.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/bojavimoxomojolilibal.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/mubuxaledasal.pdf
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/64718814762.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210904_DA006359F7333497.pdf
    • http://parvazyab.net/basefile/api203/files/mipulefaxopiwizupima.pdf
    • http://tolltisztitas.eu/userfiles/files/pimojugexuneve.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594481498b---36013618619.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae8f.bin
c0401fd9b0c02c3b6ddabd62be2246a55382f5d43e6ea1d1c8deef856c054733		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 14832 bytes
font_01_sfnt_off0000d3d9.bin
d95cac5432b2938f1ce99af9437b2af920c418261b9c548059499fab96043f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 10240 bytes
font_02_sfnt_off0000ead7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 16792 bytes

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