Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d3befe857c1052…

MALICIOUS

PDF

85.7 KB Created: 2021-09-24 10:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f65a8225d857e1c066ced496de8b165a SHA-1: 151fb102636104c3da3db29ae92820e8c1d7900a SHA-256: 58d3befe857c10528f91054a0041e667f83c6a606499850c6dc73359762ccc79
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary attack vector appears to be users being tricked into opening the PDF as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613da778d996f---tudet.pdf In PDF document text
    • https://parisnordmedical.fr/docs/file/268326826.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/87063012687.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021941218279673.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/71136489865.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/remufifudojifidexatamub.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/92280422191.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i588n1bmtpvi07nuav15kdjcue/16173123054.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/90708661565.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/xapimi.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109110657063002.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2df7d3b45---87841139094.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b113f23301---demutozeketapogiwulojadig.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/35834282555.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/walelukopotunu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/sofojabutisonupe.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/84422459464.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///jukifafefavitoliropi.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/41150998295.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/lolupasuguwilu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60bd846c3---ledeguwovo.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/besalibuxisenixewedew.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/revudeloruzeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=things+to+do+with+your+android+phonePDF 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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 10888 bytes
SHA-256: 4f836f14c588c4b66f3945e7fdb70a6d6bc3c8e1dc9729c9a7bbf8bd9cc83a8f
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 17620 bytes
SHA-256: 334d66e331b207bf5e1679dffefca1c95f4bebf206c670949acabc7fbd2ee672

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