Malicious PDF — malware analysis report

Static analysis result for SHA-256 839f839522bcd06c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 17:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8cfc9b4b1e0aea6cd6f5f35ac8bc28f0 SHA-1: c99aa37803f7e81fab0f61cb29b80d70cc9ccf00 SHA-256: 839f839522bcd06c1ad5415af022ec250c23afd2b824e3e71f4ce4cac5e0f421
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to facilitate credential theft or malware installation. Several URLs were extracted, some pointing to compromised CMS upload storage, suggesting a distribution mechanism for malicious files.

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 http://gyogytornasziget.hu/uploads/files/zivojafufixuzisijipero.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f202fb60---buposomukolikobax.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/9084278879.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/67519704537.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/bojaf.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/53863720278.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/kegejobavisunaganazoz.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/xefirukipetolezuvi.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/53486115087.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/xopegezopagab.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/44562813097.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/wopaxo.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lejijujokupolezapuma.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/14182964952.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/bozewelukexexadexemosezi.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/fadojixanifilenamo.pdfIn PDF document text
    • http://dhf-china.com/d/files/ralokatuvarewap.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/wisakuvusez.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358639df3e4---sonekinuritadisabuzuderi.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/pekidakiwifusipuxo.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/41851264677.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165592b4b9---9670554755.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/70956466635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dream+league+soccer+classic+apk+downloadPDF 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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 17900 bytes
SHA-256: 6ddab78469cce0612696d8dfb5ece316040fec49830f318824c7cd049a0e5ee4
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 11036 bytes
SHA-256: 1d47f9579079fa9fd97e00ae6615f15bd3f6c9f0a94e91713dcdd199b2c27292
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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