Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b92c0c1ad40506…

MALICIOUS

PDF

64.0 KB Created: 2021-09-23 03:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cdb85786c2d3bf63f5122b96c72bf25c SHA-1: 8d4a4b1108d43b50f193bf25d6cb0ae7268547d5 SHA-256: 81b92c0c1ad4050642761864826097d038f4a4a1910667234de2769ce66017a3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests links to compromised WordPress upload storage. These findings suggest the document's primary purpose is to redirect users to external malicious sites, likely for phishing or malware distribution, and it is delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4667

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=read+the+secret+circle+online+free PDF link annotation
    • https://www.rapn.ru/ckfinder/userfiles/files/gegozunoribepo.pdfIn PDF document text
    • https://tmtteks.com/files/kodegubezofivadefe.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/lijowiladawesisegutelopa.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/tusoworolejiruxirefamerug.pdfIn PDF document text
    • https://mauspro.net/upload/files/lawunupojugasalugag.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/tivitedu.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/20818769789.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/26138804519.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/74827719338.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/68264406685.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613764a84a71f---13361068172.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18c393c3a---fodigaga.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/10/jatosuka.pdfIn PDF document text
    • http://emannsltd.com/userfiles/17876207798.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/86989019482.pdfIn PDF document text
    • http://scsychem.com/upload/files/44036739402.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/rebixujesobazamuziga.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/78671023638.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/38108104377.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/lugivomadenenuzogafabubug.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c32cea86---xesezijezomi.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/fomipimifuwopidozutuw.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tm4gmec5odvu0qha72i4534jhk/17100774455.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/jenijidedu.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/pogisutoleg.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/43365244041.pdfIn PDF document text

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