Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cd47f725659c0b…

MALICIOUS

PDF

82.9 KB Created: 2021-08-19 11:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d861d30d9b727d5f2566da07047d41b5 SHA-1: 2048aaff3c29434dcea0570ff16b86b134b8630f SHA-256: c4cd47f725659c0bb88ee523c8cf2919acdfc4a8726fd09541a8f1087062a79a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609209dd513fe---kipok.pdf In PDF document text
    • http://newabel.com/ckfinder/userfiles/files/funerewomuj.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5647b97c2f---60076949387.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/lbmsn6485qed83o45fag83qt7n/70671184208.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609829d14721a---46217479873.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/aa0710bbdcfcab43ed8e916a2c7c4aab/gesewetidadenajitanu.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/jawapezesemafobivogilebew.pdfIn PDF document text
    • https://clove7.com/userfiles/file/96388608586.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff1c376d5---nukepipuwanopojotodajamax.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/japanejazikiwojevipir.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/donasobajovanuxi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccd441cdf---22833996442.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/71497059495.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/h6lib9bi98apvs3i84de06obmi/2198708700.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/97129954433.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7bb81fb89---53751931599.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/26902063031.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d58b6411d62fab8a8641264cc3f80e16/23510633616.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/65543272087.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/kijotopeb.pdfIn PDF document text
    • http://kalikraft.com/images/file/57517830315.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f58a5f9b12648fb5501784d474024386/46762721592.pdfIn PDF document text
    • https://beaszemin.com/files/41091480334.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/viwan.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/semalufot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+comment+on+a+performance+evaluationPDF 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_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 10716 bytes
SHA-256: 4db0c84255b7a27793b9e2170dcc13881049cca820504de8d8aebc15f8a21f64
font_02_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 15912 bytes
SHA-256: 341dc8b35d3d1c6cb364a8da3e38f59acd19bdedbec7d435f7ce35b55e20666c