Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffa43804a2d5bc2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 01:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a48d85e19cbae4fa3fa9de897f9f2b8 SHA-1: afd6b70c61e99251f327d97cce55795e3e93c81d SHA-256: 2ffa43804a2d5bc29be74a4755d66a7d85503a45758aee062750f3f7305493c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://tko.wavedev.net/img/files/files/83788682320.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/93442113644.pdf
    • http://1-sanya.com/blog_images/blog_/file/pajun.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066736ccdd---vitozurasikodibevomabubuz.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614287c49314f---betalutujuzolatezuxijef.pdf
    • http://odontoflash.eu/userfiles/files/90582737294.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/17389200326.pdf
    • https://senegal4d.com/contents/files/dekisodep.pdf
    • http://benetalent.com/upload/files/81623187050.pdf
    • http://bumsnab.ru/uploads/files/73436848861.pdf
    • http://esipro.fr/userfiles/file/safezogev.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6c223370104156e65a03a052c94fcbae/99455863876.pdf
    • http://www.pattyn360.com/upload/forum/files/2694349108.pdf
    • http://forter.vn/hinhanh/file/kugufizixijisujer.pdf
    • http://eraldocomo.it/userfiles/files/ruxubefazupudakaruje.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/9577699540.pdf
    • http://gmtshipping.com/attachment/file/boguzu.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/kuledowidologo.pdf
    • http://susutour.com/userfile/file/13161118798.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/tudonabo.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1276ebb651a9497fe7d5faf92458d3d/95743411768.pdf
    • https://confeccionesruiz.cl/UserFiles/File/nikotakelimugekukekowi.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/72240210761.pdf
    • https://almentispharma.com/ckfinder/userfiles/files/bololutozus.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161496ea1011f1---83019472305.pdf
    • https://sukaunited4d.vip/contents/files/86565961496.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=main+game+onet+klasik+online+gratis
    • 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_off0000d7dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16792 bytes
font_01_sfnt_off0000efef.bin
38af9a30d6629d671c1e549c213a264e19da3b250acbf6151c69c7416411cc4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 17584 bytes
font_02_sfnt_off00011e0a.bin
5f5ea20fa91a45b1481748c332449dd81a22bcfe5814cccbb52155c51c50d24f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 10536 bytes