Malicious PDF — malware analysis report

Static analysis result for SHA-256 08588ffdc62abd4c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 22:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f8b26b230b04ad5c9aed579f95b0b21 SHA-1: ed215088706eaf65bc260a808bcc1f16fe4cecc1 SHA-256: 08588ffdc62abd4c76fc06008fd76e43fb0421026d2439323e249882deb4d77b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6930

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://krisoc.ru/uplcv?utm_term=gs+score+history+optional+printed+notes PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7637cef8---21929637327.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/c6d2mlacvg7rggotk9u7qtnhgm/93299355828.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a9f9cd3dc---gifejivaxepezijirukus.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160944e04148d2---birirapiwe.pdfIn PDF document text
    • http://ledins.lv/cms/file/59219089170.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/garekadinigixitedebalumo.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/zoxezetazemova.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/e9166cca8c216b56af71f56dfc0acf8c/vezitozo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/dotobibatidutakamu.pdfIn PDF document text
    • http://la-klamm.org/userfiles/file/19774448042.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c06a0ff3---92059262899.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/85a1e20215fec81920a2b051147e636c/67842426180.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/wijisugil.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8e44180da55592b0287455fed322e3b2/fugebasivi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79bd782e9---fifiwupimotobej.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/fisajejax.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/3178386328.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29f6333ee8---sikikovujunawoka.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/s91q29n55u4vge7ipe5606n1hr/81510829860.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4141e70bb---19741350749.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/78724373223.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/togibodazuwu.pdfIn PDF document text

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