Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7c73c8b8f0ff9d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 16:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a7884723c7b76e250a2fa6f655e4b001 SHA-1: 012cdab9592b36fa3ef8856a08ba0810cf5e0923 SHA-256: 7a7c73c8b8f0ff9dff8179e05e82dd39f179a7cfb5d53154b0963bdafd22860f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this PDF is a link farm designed to redirect users, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=new+odia+full+movie PDF link annotation
    • http://9262895.ru/ckfinder/userfiles/files/loxozemikezaxo.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/rumonurataj.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/rurajemalonub.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/depabeko.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/lapifetawerikimajil.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/xaxogemurekizubizegi.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/6904523850.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/59250304861.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210919182314_pn5h46.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b78c5d423---14002367353.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/91483230634.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/24625497844.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/61876730853.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161472aca81e3e---pevuxokekaxixaja.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaafc20b42---3882146496.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/92003852298.pdfIn PDF document text
    • http://ifap.it/images/file/juzizej.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/papewokupew.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/kuxoluba.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359bfe3244c---tuladigivifebodefopumomin.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/nofotisojezememapu.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/witubo.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/88432624020.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_off0000b205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB205 15672 bytes
SHA-256: 88f361e14c6a2770f3421fd348b1fb78cab29cf51c9272bac18bdad098862964
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 10276 bytes
SHA-256: 7b57aaf8991cdf19ec9e9241cbcc1caa5c8b361e8b9c1b9810a8685987954933
font_02_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1