Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ae98b54700a4c6…

MALICIOUS

PDF

64.0 KB Created: 2021-10-13 01:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b365ca03ae5a248c3a2c80f815871734 SHA-1: 81d583338c55c26221792648385c869aeccdc3bc SHA-256: 86ae98b54700a4c61ac2e52bbd0fc1edb848b36e29a4ce70345b04eda4706b68
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the nature of the heuristics suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cbcd6e268240e2b0f3d276e4ba74d0dc/lafosojapus.pdf In PDF document text
    • http://siamintertrade.com/file_media/file_image/file/97656427214.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/9248723978.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/gesalevudikafepatunuxafox.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/jisifekowajasigok.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/68929700672.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/kuwojataz.pdfIn PDF document text
    • http://birdwatching.sk/media/file/40966461252.pdfIn PDF document text
    • http://telektrans.hu/editor_up/33117066693.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/rabowokalabo.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/27891561655.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/xuvadage.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/20242122244.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109140544136777.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/valuwunudojigi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429b8763e20---18810571601.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///28236983317.pdfIn PDF document text
    • https://megashina24.ru/files/files/58585990293.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/39375191291.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/nijilifupuxilotawef.pdfIn PDF document text
    • http://altus.pl/userfiles/file/66072305934.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/92579868566.pdfIn PDF document text
    • https://adfaveo.com/image/files/20210925_054530.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561d3272a41---divixanawoj.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/95429120870.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=comb+over+hair+baldPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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