Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c25dca1d47bb5f2…

MALICIOUS

PDF

65.3 KB Created: 2021-06-01 00:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec25e7388be474a5f4af363bf16cc5f SHA-1: 4268006d1dd27cf8fd4a8bbe8a5ddee08120e2a7 SHA-256: 1c25dca1d47bb5f2d4066f23ce606d9ef94b96415b084c0ec60dd9d817d57d48
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a strong likelihood of malicious intent, possibly involving the exploitation of PDF vulnerabilities or social engineering to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8461

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dc5571e945fc7d906e50e779b0aa261e/zemotunab.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/nsp1bl0g1gjv3svmacra22ppo8/kifanunemok.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b1f191eeb---63920192085.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/morigaxevoz.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/86679560025.pdf
    • http://legalinet.eu/userfiles/files/rilivenibob.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/q9qidg6nse563ec1q96r7f6utc/mirixexebezebomo.pdf
    • https://amd-export.com/site/upload/file/2848009369.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/534342e9326059f8480e724b2d31ac5f/sakugazemituda.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff39f79afb---dikopagubojugovolamoradil.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1f2277c9ed9735b2314218d8954e91fd/wofajugujolelitiduzavane.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/51108ae34133dd9f3282fc1784fdff92/pukez.pdf
    • http://ahxxzx.com/userfiles/202105/file/78007886031.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080743609fee---jijotutizozaxovekekaw.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d63d2478fd54e8c64ba721d67253820f/mubejewabibugajabiwidob.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608866a478392---96776024688.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=baixar+pdf+do+passei+direto
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77e.bin
064bf51129b30bb80138a93ae6b8744db61925343a50cc1809f829296ab17e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 5120 bytes

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