Malicious PDF — malware analysis report

Static analysis result for SHA-256 71eba8c5d2523fa6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 15:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36736309206b6f974a4c87ffe558a794 SHA-1: 1cefa104e49e71bcb762288b85d320002cdc25fe SHA-256: 71eba8c5d2523fa6e5afbc394ed9fffeb0c22d9354eb09f91155a9c038094413
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm heuristics indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=schneider+electric+unica+%D0%BA%D0%B0%D1%82%D0%B0%D0%BB%D0%BE%D0%B3+pdf PDF link annotation
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e029a2f08def0844b207ff914611eec2/79840915777.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66048bfa8---43150764964.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccaa557b6a---dewipim.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5tbg0qsc6f88615vp2qmoqahcp/84372678840.pdfIn PDF document text
    • https://angkagenap.com/contents/files/jesepo.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/17976760238.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d57a8f78---69424725866.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/78678399208.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/mekozelo.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p51d1ha0m1uuoq6072g41966g3/wexokuma.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6df5fdac---36265008186.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/pizemowukotolofugole.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a7c3ce97---warebepamorek.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/39940069778.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/48112804607.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0df22732a2ce0332800207ff9c7a56bf/xunisawazilejo.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/fexol.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/xikofod.pdfIn PDF document text
    • http://slsnn.ru/content/file/runagepetopelenezofa.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/mimibopelizesavomupuwavo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d0445d3abc6f768d1442344e0f6c7da4/nirilek.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/widolinorusizuvifotipa.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_off0000b71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71A 22096 bytes
SHA-256: 2799ed4b11c4868b1ff8c5c37586a51fe777abdab822517a02ee028b748c162e
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 11204 bytes
SHA-256: 18635f34c38fe4cf50ee1cdd8b69245ff2070a9f2575cea6b563b753058d1e82

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