Malicious PDF — malware analysis report

Static analysis result for SHA-256 95831fbc4975f62d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 14:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0017a0365666dabbadac83effda59743 SHA-1: 89807fb1b53c998a6dfefd7f17840e4801f20013 SHA-256: 95831fbc4975f62d2701862d7199720b350f5a1ecc29e42dc795c73eb389dcde
196 Risk Score

Malware Insights

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

The sample is a PDF document that 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 malware installation or credential theft. The ML classifier and ClamAV detection strongly indicate malicious intent, and the numerous embedded URLs suggest a link farm designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://pistant.ru/uplcv?utm_term=introduction+of+computer+pdf+download PDF link annotation
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/q90fom57gahfje1ff61uo06v2k/bibimupekivipumexewa.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/webux.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gemagumaviferu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a0c2e4bba7ddd482d97e8aba478c9388/71940631290.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/73682771256.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/18245158507.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/80650359452.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/386d7ba81d73bef5cc2553afb7ca69be/votaj.pdfIn PDF document text
    • https://datajournonepal.org/files/ruveriragezunelinad.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/kuvevopuzod.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/95788333567.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/pexukiwojiwixalezexomimo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b57e8ed7---23679146989.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/3347523740.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d146c25a7---vobinebebunusugalajalu.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/zubesomug.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/liferurukumulivasaziz.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae7471081---23508527161.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095adf540581---mogonipuvezomapi.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/23419694697.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/wobuziwuzimefasuw.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/85858898545.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7taobc01o8q0h8bcuhgqvc52o5/pefukazafol.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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 17424 bytes
SHA-256: 1bef87b75a95517830447100ab00695ad8325d8a0c3ce013e1899d68b2c43106
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 10752 bytes
SHA-256: b5b3db8329405c748e6786fee470d674af2e0a34c7dbcbb16428b45e85f19f08

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