Malicious PDF — malware analysis report

Static analysis result for SHA-256 890ffe9d511a9701…

MALICIOUS

PDF

115.5 KB Created: 2021-09-01 18:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dabfbdebb5ca374d5b6148dc8d116ce2 SHA-1: ae994d21c7e7e61a8d31bbe12b7a90b8567e5c6b SHA-256: 890ffe9d511a9701f4810dbddc8fd62ad93daf870025a4eea6ece95fe7e8a820
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files or conduct phishing. The ML classifier strongly flagged this PDF as malicious. Although no scripts were directly extracted, the structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 5

  • 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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160877a8b91792---bilimiv.pdf In PDF document text
    • http://thomas-zigon.de/images/file/29759091647.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kuxavemisafobivezozubig.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/95749394903.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f25ae149e79fe2399e597aed767f0642/22963436187.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/vogitanumowenenupilukojut.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/nexuzazuxexaro.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5826781bf---tevab.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fnt3esrh3t18q1ip9mpau75b44/kaxojosu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a9ed11c0---kerexiku.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/uk2meh6amphi7qfcqa8v1qf4j8/bamefip.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1210b9b7e---vujilis.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/37884475454.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609042f79183e---26538291150.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/fawutamekatetovukaseb.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/50404512092.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xewofipoxa.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/mbjf0838ii7tcbeqat2949kp86/jenakimirarosimodirifikuv.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608089c10f895---59979396065.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/revonebetupadidosuma.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1c42d4ecf---88270868088.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/korisimumasijuriz.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/wiraxarawazukuwanobulem.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rnkacm8ncnghhuqcf7302dgpf4/zizebuxewure.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/13691862667.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/72376775608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=marshall+mathers+lp+2+download+zipPDF 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_off0001579a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579A 20764 bytes
SHA-256: 25cbbccdd10e0051e0c34a86f1b6685d8b5b0d7f42fa399076de36c471a3277f
font_01_sfnt_off00018f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F2C 10916 bytes
SHA-256: af3673e41f65eaf228a10b8e602f6cb856b51436c3ecb2eb3de2b3b916225f8b
font_02_sfnt_off0001a866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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