Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c23bb87356226c0…

MALICIOUS

PDF

54.5 KB Created: 2021-09-16 15:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 238cd8d044f27da73402dd2184eab432 SHA-1: c0457ec8225d20dce71680a5e9797ce991ce9fef SHA-256: 5c23bb87356226c0dde6c090382c52b6beafec278b08b835f433eca33e1a7462
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file containing a malformed stream, indicative of an exploit attempt. It includes numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5894

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://infrive.ru/uplcv?utm_term=how+to+transfer+files+to+new+phone PDF link annotation
    • http://marienoellebermond.com/img/uploaded/file/domikebezudesaje.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/tibilop.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/menugisap.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/jijarijefatenexevinavuzo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf6f43406---47615998825.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/44167708802.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kp8qjjaocd72ojnev78d6l1n50/99534692946.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/vugorigetalawuzexutifapuz.pdfIn PDF document text
    • http://varvshistoriska.com/file/lalikubanozonewajozaxoruk.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/gejaxisu.pdfIn PDF document text
    • http://perksys.com/userfiles/file/55790925851.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/2964864903.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c13eca74---fegixakolizawibojif.pdfIn PDF document text
    • http://htwy.com/upload/file/58239671572.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/bujikibefeg.pdfIn PDF document text
    • https://www.confirmedtour.com/files/xusuz.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/80680467275.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/lusisu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614152abe66df---14918857104.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/42921180292.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/30520548870.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/pabupuburitipufokesagim.pdfIn PDF document text

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