Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d83e968b55c9f7…

MALICIOUS

PDF

75.5 KB Created: 2021-10-11 19:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-28
MD5: 5d5e60d66bb4f884cc419dc6bfb71f1a SHA-1: a800d58ca74c5ad0882ca21148869a012e78b07d SHA-256: c5d83e968b55c9f7baf70e0147071ed6fd8c8b69728e97218f961ee4ffa68e5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kapelski.pl/userfiles/file/mobekeparidoxumisa.pdf In PDF document text
    • https://goodline.by/userfiles/file/39181572899.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/18539731708.pdfIn PDF document text
    • https://blogsma.com/files/pozizowelumutuku.pdfIn PDF document text
    • http://losangeles.songhakbbq.com/uploads/files/19887059879.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/dodapazodawigetuge.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/60470341623.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/jefavusex.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/89282805938.pdfIn PDF document text
    • http://harlit.com/upfiles/file/kamasimubiba.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3d0d4318ecc85055430697a65e3da012/15082316584.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6ea4e5b0b---tavuweleposasulan.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/22405795696.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/2352449911.pdfIn PDF document text
    • http://kyea.org/imageuploads/lasodadul.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/61398351fddb4669a6ce62147fa854de/64747289833.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/puzebabubowi.pdfIn PDF document text
    • https://kenadong.com/contents/files/91427041070.pdfIn PDF document text
    • https://affze.com/userfiles/file/xenekafap.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/melete.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/lipifatofaxote.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7b3a27fc2---xufegigaled.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/211003220306083327fnzg11.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/kisuzogimipasesazan.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=radial+artery+is+locatedPDF 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_off0000c331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC331 17936 bytes
SHA-256: 61b31346e3843e6fefe431ebb84b64d75a849fab8d3c5d59c0c1b177e63b7d89
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 10420 bytes
SHA-256: fa0e09461e97aa71827782dff271636298882b0c8b9a38c7fb20863ebd267f18

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