Malicious PDF — malware analysis report

Static analysis result for SHA-256 505a2e43cd2fbc91…

MALICIOUS

PDF

93.3 KB Created: 2021-07-30 23:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e6cf5de1436c5d91f58b3be657be809 SHA-1: 19f95836d2ca4f7d81fc02a74433f6a17c8c244b SHA-256: 505a2e43cd2fbc91dae8a7f7d32670bf9805de09b6f289fbec0c3504c35b2ff8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=descargar+musica+alta+calidad+android PDF link annotation
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4d43bb11---zutavokatepiwivamepesoxal.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/fanukofefupojodagijagomis.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fef145cd6b48b957e3935fdc37181ea2/36617218147.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/146a7ab273c861a6fdc4663c25d6c468/lurulilideloxinagemisa.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf7741102---ronawoforejoburariza.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/rujefivamutogu.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/6585442120.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7cf54ea79---pulokulupimuxagojowawe.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/56288363809.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/90212457655.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/1e8b95c0dc85ccf9398c0fcb50bde77d/pikiriz.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/65389663388.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/wopokefeloriketadozenebe.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/045e304f1d825979d7cec9e9803596cc/xoginifepixawenokudutu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0b6d6dc88f563e72b5b5bd17e28a04df/38339980078.pdfIn PDF document text
    • http://llux.vn/uploads/files/nezopuxevativobowepe.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/vijepb8u8438v2l2ltn612ff7c/pifivokerefo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dce1dd965---92724560883.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/11254588484.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/98193038747.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610321b4858a5---nadokogifivudesifita.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lonujunovafetug.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f973527ce---kusizovopesobulez.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_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 18440 bytes
SHA-256: 05b7eeeddc4ece94ca16625da197d67f552aac487bee276749e392b8151a0f01
font_02_sfnt_off00014d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2C 10812 bytes
SHA-256: 5ce638fe947e32f252b5347b6c4541e39038a9ccf794eefb889ac6308e45bbfe

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