Malicious PDF — malware analysis report

Static analysis result for SHA-256 2081ae01dd497958…

MALICIOUS

PDF

77.9 KB Created: 2021-08-10 06:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 802827bf0a29293ff19861432c1551fa SHA-1: 46ec12e9047d9f79ce22b49bec3f2ec63156e125 SHA-256: 2081ae01dd49795817a643882ef5713a9366516999ac5370a97983c198c79a76
154 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 it likely exploits a vulnerability or serves a malicious purpose. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7669

Heuristics 5

  • 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
  • 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=creating+line+graph+worksheets+5th+grade+pdf PDF link annotation
    • http://vds-construct.pl/userfiles/file/11889738878.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/vabekifomapubu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7160aaea2850a38447620fde5b01eb42/jifinagusukaluvubipodo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/32488a5d9de94a965f7de23b8a4b691a/ribewutesawifesolidib.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7mi3ue96plh9ui7fs0p1tt1a90/tuwozavogelekov.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/748ebff0b9d152014614ea7e47279540/felodapul.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77fb3e018---paxulapunulaxusolija.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pafikonajinemelelizak.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/dutelofodexujaf.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608367e53ee9d---zupokewufanufi.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/31803515848.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c253534f1ec---84307168835.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b0b0bad12e71e0fc006ac3af6292d5dd/kalesorurefalujazawera.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/wusikajemejagid.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab6e8e2d0---67249022416.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/xetekufigawojekanab.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/22044817297.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5bb4bc722948e35870b91bd6a9912898/72125084519.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/nexoletekirasonorolizeran.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/3uf6fur0kpbq82kn3hl8sdpacu/sekigigovawewewifojiv.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb88ac01c4---renivofomi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 17880 bytes
SHA-256: 07c4760f7947a415e714fa70565edaaa7f772c6a71acd18b2f04d4ba985047e9
font_01_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 11120 bytes
SHA-256: 7493d9fab6ae437e975d8b70ea48a4632ae0b2898cc4607a70269762147d9bc3