Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5ddbbd15ca3fd5…

MALICIOUS

PDF

62.5 KB Created: 2021-09-21 05:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 219c42c5b6de46ff312da45fb40e6ca6 SHA-1: 164795a4b865474e53bebe2ab1350c46d17f7636 SHA-256: 1d5ddbbd15ca3fd59d54ee7e2e6f5f50f4ef219957bf05990379382207d7046c
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5048

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://queure.ru/uplcv?utm_term=metric+conversion+app+for+android PDF link annotation
    • https://cuatudongsaigon.vn/uploads/files/zokitisodezeti.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/wunimizajovage.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/fomowogawomujofitukexix.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/63592009467.pdfIn PDF document text
    • https://kimcert.net/E/file/28986534451.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/79133916319.pdfIn PDF document text
    • http://rayanchem.com/d/files/53937877806.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161307b9dca3fd---jotiraxud.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/12428286060.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/10748589917.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/58444183501.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0f195029---wovinime.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/rumumeboxuwadadaj.pdfIn PDF document text
    • http://arucax.am/user_images/file/xasomawujo.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/fusiku.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/47888421303.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161449e22ca2eb---63370815059.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lecp7mhbtb7g2vr4utqbpj33bu/45890994506.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/xojazubevuraborowiza.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161329c6057713---11132267372.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/67025864340.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/nasudimurujikutu.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/salatuloporufabobakase.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/bosowulazadir.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/95780871988.pdfIn PDF document text

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