Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff880b229514e766…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 09:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00c2e17636f245252d5263fceb17cab6 SHA-1: 7aa0fb5623b4b17d1b4994f742bbdd155ec4a026 SHA-256: ff880b229514e7665f483db09874d213670ec03fc7dd37696c85b80e8bf0eb72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=v+recorder+mod+apk+download PDF link annotation
    • http://bursaceyizgelinlik.com/images_upload/files/rexunabexekifafud.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/c9bf03ab0d022df5d4cde42ba5265023/46740419677.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/75539301021.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hoccck8rq89tiv3grbtjub5knj/5853231891.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/terodipizupez.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/12078652179.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/89438271057.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33b2593ad---wovava.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ec34e7c6244f7a866e7ffeac8c7ea358/95514128993.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342fc01c816---pewuz.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/30694760614.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613397ca90fd2---1223506655.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/50721495057.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/rakowoxozofizijorajato.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/pufudurabuwiveket.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/3195448814.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/72388020337.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/gilepewakaga.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/kekewizirovajufugamenu.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/1186204797.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8d22aee9c1f844b53b0e819b28644704/46752398549.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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 19168 bytes
SHA-256: 57295c7fc174eb53db3cbaac7d4f8ce17790105e0d56f04a9c0d0dc1b5318f45
font_02_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 10464 bytes
SHA-256: 05428fa2d8fd5c64b1753984bce07574f914fb0172985a5b2c442a855621065f