Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c25049d06950aff…

MALICIOUS

PDF

48.0 KB Created: 2021-09-27 04:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6ed42f285d297abeb228402f0294f55 SHA-1: c157978a7e6ea6aba74bf15bf4e1f1d3fb9bb2a6 SHA-256: 5c25049d06950aff4f8053b04511e4e3013409f8151090aaf0dee74055c2b04c
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or scam campaigns. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6441

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://ketchas.ru/uplcv?utm_term=pokemon+mystery+dungeon+explorers+of+time+rom PDF link annotation
    • http://realfootball.gr/userfiles/file/xalarojidazupemum.pdfIn PDF document text
    • http://wdnederland.nl/file/37257071401.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/fuwax.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914061524.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/juwudozifare.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/26192445228.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/27892274403.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/fateburijaletorukipimuba.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/78939154304.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/59482961292.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/tajonuritusikur.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/86b43c806ce4af91aba25849a4053606/dowolixepelenikib.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/pezugumubusirositulobema.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/fuvok.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd11417f46---kijidobawom.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/9746069281.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/93229178793.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb73d7ffe5---fenap.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/keleribuxoxa.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/53668299033.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/riwakidi.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/wowikukufu.pdfIn PDF document text
    • http://www.77ice.com/upload/files/48322644752.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/39587680575.pdfIn PDF document text

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