Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d0411035df7d1e…

MALICIOUS

PDF

131.1 KB Created: 2021-09-21 06:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b3481dc4d958e8cb7c84402de7b95a7 SHA-1: d9edc9f67d195173e4097322c8f53722f5be197c SHA-256: 98d0411035df7d1e3f4d4eec8a51e58ecc7989fd86a01db1ed9cffa36bfd2525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://noithatkuongthinh.com/uploads/files/pobakagenulo.pdf In PDF document text
    • http://okna-stv.ru/userfiles/files/95993512431.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/73203520976.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/sorinijepimam.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109020620436251.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/36825295661.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/jukomivelifeloxinar.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b657e8b018---20406524168.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/piboruvipevuxaw.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/bunimuf.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/rutemiteparuron.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/56397709843.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/28130718205.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/55376111748.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161489ed87f101---gonejizavida.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fcbe1712867bbac90e9f4eb11263e43f/boxanerusedaludidolew.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910005542.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/nobijug.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/resazofebizexaxisedude.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/38024290560.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/53437554620.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8dd965bca9f1705088b2544c4a0a3e69/70588079705.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210902002259.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/64b2bfa415324548cf46bdc638ea9b17/71866737972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+convert+2d+video+into+3d+in+androidPDF 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_off0001919b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1919B 23700 bytes
SHA-256: effa7236f4d6c1f053ed9415f278146ba794520ddee16f39470bcaa0e30f2592
font_01_sfnt_off0001cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5BF 10584 bytes
SHA-256: 9fdaf04ec3cc7970bcbab640e619679b628310ffc23fe76edd17759dab522233

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