Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe4995c3b0e8c64…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 20:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5519e2271d491a66aff554e45b8f276c SHA-1: ef3a8a8766d62cbe876db1f598dcc5f186eae3a3 SHA-256: 0fe4995c3b0e8c6429eda869c73328441de953692f8d289b1deb804b83810e40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user interactions, likely for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crysiq.ru/uplcv?utm_term=beyblade+burst+app+download+free PDF link annotation
    • http://denprokhorov.ru/images/file/xukoxuxazolaxokagumiwop.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090410344167.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/tatejurowek.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1b558550888df788e731d4965ea87445/tifiregunusewigudifapoz.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/72271188966.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/rowolinedorapezebizutaden.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/govabegilapuzal.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/29520415686.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/95178124143.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/70086012810.pdfIn PDF document text
    • http://hueide.com/upload/files/11711700815.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/zibopusajodukufofifog.pdfIn PDF document text
    • https://partnermind.cz/images/files/rexitajogulumus.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/82045544650.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45994957787.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/64649441007.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/guzajozoti.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/zedapigamodifelotaxox.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f765713eb0ccdeeea9a3c65cbbf375b0/mamudavirikasosibek.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/nogemeredonaxawuxatowira.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161387364d51e4---zabujopafuvipaxujumo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613913802198b---34210189363.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/3411112554.pdfIn PDF document text
    • http://csp.hu/editor_up/58690007306.pdfIn PDF document text
    • http://newworldss.com/uploads/file/wedevananaselilej.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/94908941326.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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 17760 bytes
SHA-256: be82d0aee00f18477dc262bc0357b8d7c9fb9ef863a48812178d8910a554fa9f
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 10892 bytes
SHA-256: 9c00c8eb518575eb990378de4a2691d30a37200cc7bc1672195e24a9971f22ec

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