Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebf76424c0c4fcc…

MALICIOUS

PDF

218.3 KB Created: 2021-06-14 10:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e0a44173cb32f5730b71f947db070b6 SHA-1: 19c2f227b11603325e49df87ed539a8619a01a9f SHA-256: 4ebf76424c0c4fccaae65acc5b3c370821fad0d64949ae060716ce8a66321a46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristics identified numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=accounting+texts+and+cases+13th+edition+pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/oai8a80jitg79rgr2vtvn1d2nm/24534986432.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/qshjm5kk785hf449issn7v0r3j/42789821816.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ncoca7u6k5gke254k6vvnff8kb/96059391350.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a8b2894f3---nuvimubeposivexebudir.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/d4qo42ngd41nqggal3uclrj0s2/padumebimevir.pdf
    • http://www.asslar.de/downloads/teraxux.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160853e2a8a6b3---titimexeva.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64f9da474---23799676494.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607050e5afa45---minabifojen.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fefa40a678---sutonavukefikabe.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4f920838---bigaxukasivobupowuvezagul.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c379665340c7154b2d6c034a1c605003/23367664495.pdf
    • http://ural-resyrs.ru/data/file/tonitewabe.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5d06b75e---tizavuwosanimepigon.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608014ebf26ad---zajelit.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ddfe60cff---82586606104.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c00d8f3b495084c28ab65fcde3519afa/82209589294.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/828914e6e26bdc3ec3ec78ec9b39d9ca/fexitamu.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf16beb2e---jebexatad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00031890.bin
a52ad523057af1bbd48616f3ceded3f9a6edd0e6459c8f1fd22d6caac9e68539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31890 5560 bytes
font_01_sfnt_off00032b8e.bin
4129b548920481f52792806a5845fc4b947c941a21ad37325f1ee3950c71b1cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32B8E 15212 bytes

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