Malicious PDF — malware analysis report

Static analysis result for SHA-256 f954d70516f13172…

MALICIOUS

PDF

130.3 KB Created: 2021-09-06 14:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f23a3b7550c94946dd7c58162468889a SHA-1: 134d7b933e313cd9b682f844c5962b2ab511960e SHA-256: f954d70516f13172d428283f7b1b2a9a37272dc91d153576e2ca97385f6dd59b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://queure.ru/uplcv?utm_term=administracao+e+gestao+hospitalar+pdf PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ba759d15---99324310394.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/jabekitetavat.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c1597e63011670b72e853206ae641834/xasevenelubemadogomedotim.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p99n605hg9h8uvq7hjggpo2fnf/bovutibukazeliwafababoso.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090bdcd5d156---lazupowixuzenigukatusidex.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/48755120787.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c137c9dbb---xarufuzojug.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/43319829548.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb82a8bac---sewokimenigav.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/lirumitorunexiwipule.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f950f44fa9---supopodozevutawekugo.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/libesenifamanodazegaluxo.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/lukolat.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/33675706884.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/fadedutatutajasel.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0naho6o7qkmll4k7k55247lfpm/5784027955.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/8137032807.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/28679279009.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/punafamawuwapukeki.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db1ab49939e---3640302869.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/43794969349.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/49757100450.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eaa0c6f57---rififobejatunudesemipil.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624952585.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/zubakaxutuzubofobavawumez.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f3afeb991d19853a8ba4b1e7bafe733d/xetideketogesu.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_off00018f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A748 11048 bytes
SHA-256: 2162a5789e44761da620243cf2d511e2976ace987d8d6c45d3d64765e004033b
font_02_sfnt_off0001c092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C092 22884 bytes
SHA-256: 41687c2b040c199d02307a93467a9e1e0257305a3eca18059f14ffecabedb42c