Malicious PDF — malware analysis report

Static analysis result for SHA-256 1683940988114840…

MALICIOUS

PDF

145.6 KB Created: 2021-06-27 09:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 679b72e36de81b5aaa805ebacd02d23f SHA-1: 46fa45cac7ab8fd9ca2dfe03c55aca2725e9440f SHA-256: 1683940988114840691efb03a8069e60358d2c3d391dfd046155b82b89e9b89d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://wastran.ru/uplcv?utm_term=sacroiliac+joint+which+type+of+joint PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/11557e4e4e2503f1f77f38520109fa75/92955856438.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b45743fc4---wubigak.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089602deb4d5---vugizerukizerutovat.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/palalekulir.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079659674460---gurer.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/bafalepibazopa.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/29831778470.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/57794276734.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/riwelipamabimegetugi.pdfIn PDF document text
    • https://fultoys.com/userfiles/medifisidadogimaj.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/59113693912.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/45fe0c3a30de183184bf346cc477b9f6/96938335848.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a1249c35fd7722b48a32bc8e644fc74d/fabuwivuloviwoxugorefofa.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609474afe41ff---nigoboki.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/07d44415a5263ef83ee284defdc77ab5/numepiwumexonoveziderowaf.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8b2531d12720a3743bcf09732486ab46/57624885386.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/8800630275.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f52e5444d77e4513da2ede0b9bc02613/86852215142.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/81572979083.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082787030f93---lipazaroxobidob.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u7s1q94hfdolgd8eqdof5u8ql4/48539848665.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f5bbc487e44bf170384f4fdee09aba5d/96959234993.pdfIn PDF document text
    • http://24cvety.ru/upload/files/jamekusofujedidamefugikan.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/96983978735.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_off0001d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8A8 18036 bytes
SHA-256: 4d3eb29d9d14a5b849cd03efb1afd7269ebfdb1f52506f389cc7f6aaa2653ea8
font_01_sfnt_off00020782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F99 10816 bytes
SHA-256: 57c8ca3cd26bd00e10907b7ae666c3d331ff109bc81cecead0229aa2440cf226

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