Malicious PDF — malware analysis report

Static analysis result for SHA-256 98df4e13fab6d203…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 09:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8dffb665c17f319da9f472feac2d0594 SHA-1: f2516baab955b0eb940380dbfc9531ee583876b9 SHA-256: 98df4e13fab6d20314ddca825710481995617303e6fe9380ae72c4e386e6b575
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to initiate malicious actions within PDF documents. The presence of numerous external URIs, many pointing to compromised CMS upload storage and acting as a link farm, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=free+angela+and+all+political+prisoners+full+movie PDF link annotation
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/mopebefowenaza.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/lexadelufivofusigovuf.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614166c1dd36d---novumazemubetegorabakoji.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161436b43335ef---faxipaluwimapokufinenekik.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/wasonamederagikimo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9ab686dee---sifugotutadopowugeb.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/dirogifowiwe.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/2354101367.pdfIn PDF document text
    • http://umhouses.com/uploads/files/10490612823.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/98255345008.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/65873438894.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4285db5db---bivumodudubataruwi.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/bosaxosuziferiduweturito.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109161635014171.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/pisafukezawera.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613877ef68996---vegogukabamenajefej.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/16452291647.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c748e6e37---17721508868.pdfIn PDF document text
    • https://protrialse.eu/files/files/68036189217.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/lukobasokotusatid.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/volutuxakegiwatiture.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614020e0473b9---jesinalugipasitedidowar.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/vezififezudasis.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/04b129a1965aa730fe8ecf1c124cf0f4/40454013165.pdfIn PDF document text
    • https://dintek.eu/uploads/file/jalegokefaluge.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_off0000c49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49C 17968 bytes
SHA-256: 7ed42e5b50f5a2b15e554d1820f6f8f0ad8f930a481bd3ed7e00b4eb9cd39557
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 11108 bytes
SHA-256: 69582006b07159a7edae8127dc3aad78fcf447b3a496ade390472fa61601a5e6
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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