Malicious PDF — malware analysis report

Static analysis result for SHA-256 76984a8996e30a4f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 20:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5e115bcec4aaadf21372e3918d34442 SHA-1: 9d354d5d20bf0e4db495dcd7c5b056e7f0b27d71 SHA-256: 76984a8996e30a4fd08abfb5954d00aebe403cca089ac1092a5b7b2a446f0233
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs were extracted, some pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://galerie-louise.be/userfiles/files/gojarumomarusixari.pdf In PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/17845336253.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160879329c76ae---48733914576.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/49014710023.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b92a8d26101c1c60cf6e4a79306446f0/72919179359.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082df4233320---93866810601.pdfIn PDF document text
    • https://ienter.bg/files/pilaburi.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/tiwusorokimiwod.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/wodiwusopopo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215191032304943.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/18/22213590199.pdfIn PDF document text
    • http://korytnica.net/data/files/37958294708.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/kufibebu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/14023392174.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/25284265833.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072807ad53f7---62121537961.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b21ad687bb63f56da905fda493df1686/19640283081.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1d3983db---kalaraweleviragamodirif.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/31319522281.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/vusujinutuvijibadaz.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/74298663026.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210623_BD3CA563496B9793.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff77c420a9c---pubavarokunevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=non+verbal+reasoning+worksheets+year+2PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/lekovufibedezafuxew.pdfIn PDF document text
    • 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_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 10984 bytes
SHA-256: c18e065629a00882424fa920939f16177138473d2bd119302512ef4abc74f431
font_02_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 17748 bytes
SHA-256: 7851cd40da24204bb1302aa7987beb6acf0431568bd9bea8d6017ac9875f7641

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