Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c3cc84a9021ea8…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 01:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fe1a5ad0a20b9101ab6f4c89bda43f56 SHA-1: 00d027e3724358394cb86959d2f39c68accd1609 SHA-256: 16c3cc84a9021ea81664e2b5b2ad834e6134749f32c338770d8f4ce6df69b9f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=ui+ux+designing+software PDF link annotation
    • https://aluminiosarla.com/userfiles_arla/files/91663435051.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/mitopolota.pdfIn PDF document text
    • http://teresachild.com/upload/files/dodowetimejexalawokizuji.pdfIn PDF document text
    • https://zzwgjx.com/d/files/34015450959.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ngnon7q0hfmoj2eh42mjpessrj/mopurifafe.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b9b3dae8f85b0f5a92a73bcd575299e6/milaxamotudobivubog.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/46368929331.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161323b18e217d---fofisebonaje.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147b058e8d5f---litegoteto.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/82lng6c54p4vktuv8u7paji374/gisij.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/27148447868.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/502b7799ab9deb5bd2d9fbc44a091898/fuzipugefeguxade.pdfIn PDF document text
    • http://rayer.cn/d/files/33672769762.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/rilidizutepapi.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/loxulexunu.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/30312114970.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146fa1c4720d---dikezobomufefevodidaraji.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/3448425699.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/55124792991.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/luzidilujaxeruzip.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b616e2a235---68104867196.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/38619537159.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/wixugujexawuw.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zutagukifusojinuw.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_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 10776 bytes
SHA-256: 9e5fface1ea85be6950565377cecd89a7aa982444258c37ce7a5abeeac31aa93
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 18332 bytes
SHA-256: 53badb910a365c96622a6414c532c565d3022c6a74c85284e90a6680d5499bac

Open this report in the interactive analyzer, or submit your own file for analysis.