Malicious PDF — malware analysis report

Static analysis result for SHA-256 1114c41722a6fdf2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 10:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 210688209339eb7537ae8d3f6544b8b6 SHA-1: ad882b1c304e7a4b8e9658fe899c3e93c1407920 SHA-256: 1114c41722a6fdf25f10b60543516fe8ca38aa13316532b09695ac76919da3c5
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. This suggests an attempt to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082952b77c0f---punejubulutavobirus.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc37365024---60560070192.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/51402581450.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078084018d23---28970468013.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cab177ae963---sebava.pdfIn PDF document text
    • http://agama-rc.com/upload/files/88146998073.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/34913631297.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zupovepajefoni.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/25536585577.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a799c43876c---xunetajanexukigatida.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81889236490.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4a4545bd9f8da9da0af5e05ba2b4e218/rabisuzadevuxa.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210811_787D59282F77F3F0.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/kpvkb98lsphahm4ep2rk21tge0/jilijunupabifokefuxozaw.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/jemumukedeguzixunogevog.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pabozef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9d08cf22---31893526167.pdfIn PDF document text
    • https://bem-sa.com/img/file/34509313900.pdfIn PDF document text
    • http://keacg.com/upload/files/30229090586.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/68a30f3cf4c36f47573a5b3c1598114a/nudebedojubifiben.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/88080611128.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070204512094.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc58a61fb61---37245493361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mapa+politico+espa%C3%B1a+vacio+pdfPDF link annotation
    • 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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 10676 bytes
SHA-256: a415e4fb42acce0a3056c581a525c1685c6cf2a11db28c05ee29164545e6537b
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 18364 bytes
SHA-256: 051bba3cac596bc6d3d65ed08a3fd50a9cfc011f3fecf6c3ab453fffc0b06dcc
font_02_sfnt_off000125a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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