Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da8c5b0a8d462bc…

MALICIOUS

PDF

96.1 KB Created: 2021-09-04 18:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84ab63a918e982af3b27d77580afe86f SHA-1: b02a09dc961cab56256ef4d838cc659d81709581 SHA-256: 6da8c5b0a8d462bc2bdc25448bdb3061a97cd37832a97e6ce628c9b9c8d271ba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a coordinated effort for SEO manipulation and user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://asianaccounting.com/admin/fckeditor/userfiles/file/dibimitowuje.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/592bcb502ed2e44811a191da3bf3cb70/defogegidegofimudafowa.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/resufavuva.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/zasufulit.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/24/zefasukesunofoj.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/73954098151.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9b846eb3f---wubutupimufodumuda.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/31205984945.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a232341e7ba52f7bca79c12529dbaf1f/valubulek.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021072313503253979.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bvtp2qolc2ck5li7fibclhsg8g/mixulutakenul.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/44705873667.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd4a9ace1---61727506554.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/nawudanazexojuxolu.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/07fa309500ebee0e61356e1fece596bd/24761955380.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/36835322196.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/84508340202.pdfIn PDF document text
    • https://polaria.cz/images/file/4858239353.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/30080182577.pdfIn PDF document text
    • http://goref.ru/files/file/ganurobavusewat.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/tomixudesigufez.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf07850ca5---xomafevofepuvamuzukemujir.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ogj13ib9mpqp5lja92tca7i3kr/falopodenekob.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1c2eb9133---99420504084.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f918ba851cd---30209283325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=exercice+amortissement+d%C3%A9gressif+avec+corrig%C3%A9+pdfPDF 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_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 11224 bytes
SHA-256: 75b53b776b75e259e6ec19d414c0c96ed0d3ce4e8a8660d5ee116cab332f0fae
font_01_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AD 22484 bytes
SHA-256: 16093081fbb12813278fa6f1d4c55a86be0f88605cfe8a1cb392a28e0bbee554

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