Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9badcca2e282f4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 21:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 3ceae497d6de36f57e13181398a9e004 SHA-1: d4e7d651abf7c54815d477b07cf2a58c37a61f21 SHA-256: cb9badcca2e282f45192d512267a00d34a8d881a1ed9fb62d97efe4d267e769f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised websites and potentially disposable hosting. The primary goal appears to be directing users to external resources, which could be for phishing, credential harvesting, or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://euroteam.vn/ckfinder/userfiles//files/jitupejigu.pdf In PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nodetaz.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/38575342452.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f7ef2618e39e70ee6256d9bb92daeb57/josar.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/67422290444.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/jidumabuzomujuninidegi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12f92223d---vixudepukeza.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/bigikekakafi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa89169bc1---44814037152.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/pugup.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/lfmn2ojqfs4lpvbjqqj97911u0/5792340008.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/crm3etmb7lvkm52c9nku47ivpo/sadakemiviwiwurukep.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096733c8e176---16209103551.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/oe8hhoiekq05mrf2tlavfeqjo1/74671125088.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/77686579221.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/45035397802.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/15478542347.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/gewexadobofinidobu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4752827d9---visuromalidevuvufofuva.pdfIn PDF document text
    • https://morabia.fi/images/file/8475797881.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/86673765996.pdfIn PDF document text
    • http://laduses.nl/image/file/37406973504.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/65332647559.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/fe94651e8f56ac28d7ae4cd7ccae237e/79227070917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=elegoo+uno+r3+manualPDF 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_off0000cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 10348 bytes
SHA-256: 41d0d2739dc3bc833f4dd8acd572eed49111cf123f3333b9375eea92caaac087
font_01_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 17756 bytes
SHA-256: 43f0d33b8b4b13d34a47ed8a5a739535021be4cb2f0fc50d7de9b900253cebd1

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