Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d6e4a9fe26862e…

MALICIOUS

PDF

49.3 KB Created: 2021-09-10 02:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 88ce84b45209f97ead0dd3785f6f425d SHA-1: 86cebdd7292ae7b7663f47bdd1634dac4613eb9e SHA-256: b1d6e4a9fe26862e19c06f29d62ee8b597648643c7bee7dd5135c58ba850007c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The presence of these links suggests the document is designed to redirect users to malicious websites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7119

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://ketchas.ru/uplcv?utm_term=9th+social+science+textbook PDF link annotation
    • https://taucaotoccatba.vn/images/news/files/salotodasigezu.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/pesetepozukeseli.pdfIn PDF document text
    • http://sro52.ru/uploads/files/90940803169.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210907125326.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e004a3585---4974171511.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/vudozagewesilosu.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/dolefita.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/44418650655.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/68475209195.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/rezalozirezoza.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/vugotitugigewepajile.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/jupidivovixazabegiwomevaw.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/48459156538.pdfIn PDF document text
    • http://abc-tel.ru/data/File/30352926616.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/92462814686.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/87344292481.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/48507780447.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/jezigane.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090500205473499.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/31301845455.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/27ce1aaf04fc85d949ed94d8b5d1f1f2/68101205851.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/xoruboz.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/62c886e549ad45bb5227cbbe4f7b9b5d/bukanemerepiw.pdfIn PDF document text

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