Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1f396580e2dc77…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 19:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 15cba2a7e471bd7c156970bfbe48df59 SHA-1: b98d8d533d6c033bd0134994e63ae4a0938a59c5 SHA-256: 2b1f396580e2dc772299d399a47544346e4d643f82301b9606e2d8cfafa81143
64 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO poisoning or to distribute malicious files. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4833

Heuristics 4

  • 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://archism.ru/uplcv?utm_term=elementary+mathematics+pdf+free+download PDF link annotation
    • http://www.pattyn360.com/upload/forum/files/56791859062.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/radid.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/40430b527b47c0865191d346d90d4a78/36612137560.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/94393098938.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/xutepuwevanonerifos.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b2ee51d4---nadefimeganebanuxewob.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ea82c372---88107943638.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9a98899aa2c2f259a8a5046379cdf0a8/79165174821.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a7f220293a51dd0bf02b1b567056a780/pigimogubakigab.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160774c1909fb3---gudexapigamovinide.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955e14edbe6---32567283178.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084c13179dad---pafimudujew.pdfIn PDF document text
    • https://bloc-immo.com/images/xogobiroxibudoruxabejo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/15654908482.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/803f65df5f96d149927efdc42dd73cbe/36289092719.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/60574708709.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/fajelexinanozasaviwana.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/91899758166.pdfIn PDF document text
    • https://melz-feu.ru/upload/84555390187.pdfIn PDF document text
    • https://onecre.com/images/content/files/nomomefafeboxesasakijaru.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/pexadanejesunepovadudulus.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/gegefuwesudupinazonib.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580b353307---neromefade.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/xavurigo.pdfIn PDF document text

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