Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b14d978d5701521…

MALICIOUS

PDF

46.6 KB Created: 2021-09-19 22:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 291658b9dd2ecfaa83f8ede4b156ec28 SHA-1: 055c99f45066f8b575495458f9b89756d51aac8d SHA-256: 6b14d978d5701521fcc925fb7e7a6c52b863fc4f4b092f041267eb1665c5c0d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9295

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=secret+apn+settings PDF link annotation
    • https://ssvacancy.com/ckfinder/userfiles/files/7398536064.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba514c45b---xutaxuzogeropifefigibe.pdfIn PDF document text
    • http://remobudostol.pl/pliki/30128547307.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/95631433875.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/2094928369.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/kisumenorufulibajo.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/wisesipenutenitajareden.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/23362816761.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161478a0f95196---25470319951.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/woxamedoz.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/35458567175.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/43948032242.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/gifolivuvixepef.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/91212896576.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7bd0641445349e05420139ef97bfcf2c/77876755252.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/pulijuzamenijidipik.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/sagagapubakolovuvumatew.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/doluxaliwiserujo.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/7628444885.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/nafomikeriwumuguvotuzu.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/pozetoga.pdfIn PDF document text

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