Malicious PDF — malware analysis report

Static analysis result for SHA-256 90028d78e8c36734…

MALICIOUS

PDF

67.9 KB Created: 2021-09-19 06:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a74703a37f124c1449cce10da7fe9610 SHA-1: d1edf36df1355e403050be7ee4a6074dd3c439d0 SHA-256: 90028d78e8c36734090b01477029c178a95ebc6c1959444e172c66ba418cd4af
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5194

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 http://ambulanceservice.pl/userfiles/file/xemexedijuwa.pdf In PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64427882547.pdfIn PDF document text
    • http://school15-tyumen.ru/f/72627708908.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/97474293861.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/5051518065.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/tulewid.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/59140949244.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xupunovekukuviratawawifov.pdfIn PDF document text
    • https://businesslife.com/content/file/bamefaxetav.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/katolet.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133df0a47758---nodofefur.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6542455e9c4a9e9ca39e0f27c23a840c/92785049284.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/xabojinojonegos.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/95193406599.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/67852003457.pdfIn PDF document text
    • http://savemaxint.com/files/file/71077953776.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134336668da3---55478373763.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/pemevonexowoxaxokufaruk.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/roradogegab.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/79135699185.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109191003588760.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/20190469185.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/sujogifufikunalijoga.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/35037d9d4ee15e02ccbc016898661bdd/68152146817.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/zetag.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/39429278985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=live+not+by+lies+solzhenitsynPDF 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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 18176 bytes
SHA-256: 5a072a892e19cb2f3b72d4f319d9462b11a00daea13e1adcdf098d10a4aba2f5

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