Malicious PDF — malware analysis report

Static analysis result for SHA-256 244437d7e3d4f1ac…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 15:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51ff93dc5a84fe38d2d65d6b594e014a SHA-1: c3f4c58d0a79121db1b2fda7c0c0c2707f11e391 SHA-256: 244437d7e3d4f1ac3fcb9ae2083c72b742fbc83ef843490c1b3667a8147a90b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicative of a link farm. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://archism.ru/uplcv?utm_term=gta+sa+jetpack+cheat+pc PDF link annotation
    • http://www.iece.in/userfiles/file/59442997033.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/84520744633.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2lb5fb9rcm36rjd9dedfoho75hb0no44/gujatavujinejegu.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/dekofuzeki.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613657406b987---zokeva.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8f32848b---wekazenajevapudabugezom.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/97393677495.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee7267cac8---21485900667.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/todinovugabuganaxawafa.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/33746245738.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131c85e77aff---68340704086.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/daraxilolaralireja.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a896f07f87---wozozimiti.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/67552909141.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/95308421684.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vivekukigasutidetoriz.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ujajagebojuve.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/65730384513.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/19414897853.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/326092915894a252c4bcb53af51991ca/resikurakafav.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/soroveve.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd16540bf5---reletizojefazojosox.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_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 18240 bytes
SHA-256: 14dfa796c719934a53e6c1152f0c7c55a101af14cf2afd5a9ea1fbe753e42656
font_02_sfnt_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 10272 bytes
SHA-256: e79a76dc6b733203f4fe1ff72d6d495c9245ad257016943ded5426dad27bac02

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