Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d40a919d48e1f8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 18:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11521ae23a792baf272f2783f50646c3 SHA-1: 609881ee04a464509f820e129829a02324758f2e SHA-256: 13d40a919d48e1f8b109f98d23a2d562d9daf57f82deb649a260ca6b6fdd23c5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts social engineering by prompting the user to install a browser extension or update. Multiple URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a distribution network for malicious content. No scripts were extracted, but the presence of external links and the lure suggest the document's primary purpose is to trick the user into downloading and executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=alia+bhatt+star+life+game+mod+apk PDF link annotation
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/zexuditib.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/galesekodepid.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/kiwipubedilizevamuz.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/walasexemobimox.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/58856495852.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/fatokawalisuwam.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fc3a39e3144604ee01efd98d0d13f68d/834628531.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/9906035355.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/robigixuvezularegew.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3b1e74e78---52296507049.pdfIn PDF document text
    • http://infracsap.hu/files/file/rororiwiduvoluv.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82dcead4d---fogekomodijifomur.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/dakipuv.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/safovosuvukupezasur.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/51346858235.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/notaxivugumelugakodoxebi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/o3hvfhealr1hgvocfjfj6gl4k6/pitegarado.pdfIn PDF document text
    • http://393citizen.com/upload/files/46077528460.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210913_081629_190.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/ximedepiporube.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/nubimetimoxamegufevufumuk.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/penadibedida.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/vigitufirewederu.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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 17884 bytes
SHA-256: 1a5d2b6d4bc9de9c524037df3935133bd388801ae5f632b313a854536f11f95e
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 11052 bytes
SHA-256: d8123b50178ebd52c4c5a26941c318f4f1e265896cf86425d20df0f57ed1ffe4

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