Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d324b9d47c0cb3c…

MALICIOUS

PDF

78.7 KB Created: 2021-10-06 19:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 61d9a5370e4e301eb526b6f054ae393f SHA-1: bf780920699862d829c711a932be7761b33b0376 SHA-256: 8d324b9d47c0cb3c21c5496ccfa4e8bdf1cd8bbde0a836d2cca6c1fafebfd8aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=technical+interview+questions+and+answers+for+ece+freshers+pdf PDF link annotation
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/5083512461.pdfIn PDF document text
    • https://peterdegendt.be/file/veletebusemadowuruxuk.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/55821478518.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8hbil0jc7g0trgm0jgrsat6qoi/raleje.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/74171667598.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/70312091523.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/316f1de420370a3c21c8bd06b0a8379a/virasedowaxoxumilokulik.pdfIn PDF document text
    • https://matricula.arendic.cl/files/bitokotesizorafunamuwal.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404d85eea7e---xujibodefibubekefuvubuvel.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/71612c8ad48e62f4799f74555ad3c853/95105501403.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/84603097520.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/nixokimuwududukoso.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff901d516e---37290718108.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/83728622641.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/netewelivabek.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/48925867430.pdfIn PDF document text
    • http://traviet36.com/upload/files/12476413973.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/roruvufabunenokizenenima.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613911413393c---67514944158.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/lavodisivelalevobaso.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/kegezomirom.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/40713975554.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/12907517808.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/5387400585.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/juvugupofugatezevuvasike.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_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 17720 bytes
SHA-256: ccd34ca386c11c447fab2228bd35101afb756d625ddbe02afaf1f371da4f3990
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 11076 bytes
SHA-256: a52c2661d7b0688b9dec1e574bf74d5cf884c8fd113d69bd40afbe707c9ef436
font_02_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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