Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0dfc4a79bd0891…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 20:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89ed561df076276c11dede82da525cb2 SHA-1: f819390c0e47bc4b1c5902475ccab03f8afdbe55 SHA-256: 7b0dfc4a79bd08917ef63486439191f87f59be63901fa2bc473594d564050f76
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier strongly indicates malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns suggest a lure document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://nomylo.ru/uplcv?utm_term=joyo+kanji+list+pdf PDF link annotation
    • https://somogyplusz.hu/files/kugojebuxuzonemerered.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/49902429619.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/lafamujisubuxe.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/21fa2f15a24bfb05291e734585126ded/metarobexixil.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91a8be7d3ef2fa9da9738ff4afd552a4/namalakem.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04ef0ac29---81970873841.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/65607065415.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/wuxuzikarovixuduxozipigof.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/2915649937.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/886a49563257ea9753a4ac8e2a52355c/sewedavabowezo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ab5onqtsv3glknnlqlrb9nm9n5/93050635740.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ded937e6f2---97918778292.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc10f705935---16090946131.pdfIn PDF document text
    • http://4bx.pl/public/file/janumisebapuv.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/58578017411.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/simepenefawogararokum.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/juvin.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607cda9ebb04a---59422406864.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16085612feea6b---11438089421.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c34d41537b31558c20343453744e0319/xudapaf.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/21557498287.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7jqnuuaf0qe915c23qi7t2vm6d/miwobav.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/29889223800.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_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 22208 bytes
SHA-256: 77f2aa026a10ae6a5802b40b89e4a4d96d3d3b1a812f39572655d504f037dc26
font_01_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 10588 bytes
SHA-256: 6f01d2033c22f3bf1b0fa9aab8c04fcdd6b1731adff61f025c198c6c49afd362
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1