Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abdb924dc99f3f9…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 00:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ed8b49c7d1462196a12b6ddedbf04ac SHA-1: f82534b15148fa79365cb7236ac1b70a6cb528ed SHA-256: 5abdb924dc99f3f97979632660b2a5ab75882b69663f0da4a0780bddf454b7bb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves a malicious purpose. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used for SEO manipulation or to host phishing content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=visor+documentos+pdf+online PDF link annotation
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3f4a568cd411d19299cb58d211760c2/revigixa.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/1862988423.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b23febea7---somiwakofoxizuberesax.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/putew.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/8843673791.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921e6bdc9a---77538632754.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210904_8D1D800008726016.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/fusopulifimivusotegu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0016f2a5e---jakuzikelazopex.pdfIn PDF document text
    • http://ktcz.eu/files/files/vagesirerixa.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160946e4b95024---74685843267.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/12063406496.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7a20479dd84413462c8e663ef60bb290/paxulurupebol.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/melijobiz.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/33474394605.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9ef894dc0036d8725d4a2ab4fe81af30/mifuzemororukimujemo.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/33704571190.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/21565342159.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cddb51947e---mopifilomaviderazezedu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/bupupavovuwazixes.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/f4e9arbndlvcl8uqcou4qnq9ht/53443200620.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/wipetotokeke.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tefixivasekuxopaguxod.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120589b59b7d---nonebositemupok.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_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 19292 bytes
SHA-256: 4d04ea98573b35a7742275fb0d4b94c24a15079e8cc1dba77a6a2ae046bfef06
font_01_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 10688 bytes
SHA-256: 8a7d0342c79f15ca9011b6d43e38b45fe8ddf43b55841fb2ab007c5e53586e89

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