Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc7e806e68fc8ae…

MALICIOUS

PDF

46.8 KB Created: 2021-10-01 15:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 840c9589262926785681f62820d1e447 SHA-1: 84d31d80c4c9e8d75a57de337f568225525904fc SHA-256: 8dc7e806e68fc8ae58f45ebaddf7519afb0d91d95cc6ccaa1b57bcb9ef8da56e
154 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous external URIs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7966

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://wastran.ru/uplcv?utm_term=farm+city+farming+%26+city+building+mod+apk PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315958c338c---4478464643.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/wuxakez.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/zuvebaduwixo.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/zomekajumemat.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161455a9eaade3---lubetitovafubujulefarolu.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/fefusenasep.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163300366258.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/witosa.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/guxiwed.pdfIn PDF document text
    • https://iword.de/userfiles/file/zagamemu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d2ce55c0b1071c92a4a6ef77d561cb93/mozubepirejupetobitejewu.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/xadujame.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210916_202144.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/rikepeposiruxubafi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd95d2739---72315900918.pdfIn PDF document text
    • https://shunnasato.com/32193099420.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/jitifujexijenako.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/81800399661.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613486ec77473---85361434167.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ba79a6c0c8741f9cb59c93c78b7dc02b/lepewesurojuvanifivot.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e25a839add108cbe7a5fc07b6687bbbd/jubusixupeme.pdfIn PDF document text

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