Malicious PDF — malware analysis report

Static analysis result for SHA-256 79968d5c2fffa1b4…

MALICIOUS

PDF

58.8 KB Created: 2021-09-16 16:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82ab4496738a778240a4e182e126baa1 SHA-1: abad75a054b730875ebfeff5caacb4f9cd6bc5dd SHA-256: 79968d5c2fffa1b403a0304dd4a62f40b81bfbe2b013ec823d3fb2b6c906ed8d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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://cructi.ru/uplcv?utm_term=my+phone+keeps+installing+apps+on+its+own PDF link annotation
    • https://emenu.hu/editor_up/zoxafikapeparupeka.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/dec4f77699b26c4ad001c30e841d2431/wulezenemepobuvilan.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/ragigetelujekupugun.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210914_171851_154.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/253ed6fd856f2488fe499c6b68d597bb/vitabifok.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/tiwut.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/399771c7ca13cfd7394a9a9174244bec/bofutupofobojajatetopas.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161325459b37c3---lilezuwed.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59e412cfb---5356915026.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/69441080596.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dc5a32f980f14626b7e003d5d30405b2/25043620118.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/30165682587.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/69728590649.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/fojupeloguzi.pdfIn PDF document text
    • http://ruresept.ru/files/file/sawivux.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/19878699467.pdfIn PDF document text
    • http://holzweiss.at/dabowisi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c806548b---kufalo.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/87267221988.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/vevugeweg.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/93031206652.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/21348425588.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/6095090480.pdfIn PDF document text

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