Malicious PDF — malware analysis report

Static analysis result for SHA-256 da824b823e76fc0c…

MALICIOUS

PDF

82.7 KB Created: 2021-07-04 21:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 67572e7bfdd12708294e69560f518875 SHA-1: 582c27d05de44aeeba3a9c1cbe08f45efc351b85 SHA-256: da824b823e76fc0c0b3d0daf113b7b3ce344a3475745bd7a4e6a10547ed268b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these are common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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://2acontractor.it/images/file/butegulelofetu.pdf In PDF document text
    • http://dientrotiendathc.com/media/ftp/file/38913684628.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/jilidibanobom.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0fe97ae0ddc608456a2e926322cc5f22/wirewuge.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9fed6a386795ad8eb318886012f8b86/12915305718.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7715ee5676236df7e9efa10ac0a0c222/dasanutawad.pdfIn PDF document text
    • http://naucseto.cz/storage/mitatarufexibefebatu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b21c0c80b794b9f8610f179a9e74768f/jevoxamobebirakigasugadi.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/98261060511.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079804988560---jawitejobugolusipagapowuj.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160886db878328---25845315581.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95d1751a0---67742768023.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/tejosub.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/kodizetonotabuso.pdfIn PDF document text
    • https://koratspring.com/upload/file/juwolebukikudenerojimuz.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84351254038.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cf5c48259a214385ebc1ff1b39f60d1b/67453715738.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/76718218673.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/okujowujodusas.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f5c9d7bf73e56d23a32796ade23a1cd4/75623535716.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/9fa64485ad10d93c85f0eb70acf5fa72/muxiwew.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/vagiwidem.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/samanu.pdfIn PDF document text
    • http://www.toptehnik.si/images/konefulozilofedetowapat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+embed+a+link+in+a+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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 10700 bytes
SHA-256: 11168c147048ff2c5c15447696048dabc70bf43422f6a360048d82e03abd9bcb
font_02_sfnt_off00011282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 16564 bytes
SHA-256: dbe879b438f9f58b38abca8158302a6cc78f19d3468488f3bb9990ba5b4ee85b

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