Malicious PDF — malware analysis report

Static analysis result for SHA-256 5405debde7e13094…

MALICIOUS

PDF

48.0 KB Created: 2021-10-06 00:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5fd4a4e864da2b7d9588cf5cc05e701d SHA-1: a3b402efa9e5dc0729c1c0e66246c6a8bd3aee3f SHA-256: 5405debde7e13094b418b2f7059b80757f17e4ad6c965f39abc198fe369c9f0d
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with several URLs pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links and the nature of some hosting indicate a coordinated effort to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7126

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 http://sanfrancescovet.com/userfiles/files/34624785543.pdf In PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sonepaxawigop.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6a33b2741fd80fa76a87f94426185e8c/14410639753.pdfIn PDF document text
    • https://shidoremicrosys.com/media/56589591183.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/48264467682.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/jeworofimokupuzudedugonij.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/63392256827.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/3580508988.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///donojokobenarigarexep.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/ranoladonedodoremoj.pdfIn PDF document text
    • http://www.grifin.sk/files/bajidepavimeru.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/watopimevejizi.pdfIn PDF document text
    • http://tzsunup.com/upload/ruwox.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/70623762715.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16159fc6f2d8b5---vizinukezatoveso.pdfIn PDF document text
    • http://bakoca.hu/files/file/vorofikafu.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/fivupijebusapuz.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/nowopijoko.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f50a1c28---tumupemopafero.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/39058065556.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/nixupobuluvadokoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+craft+a+diamond+bow+in+minecraftPDF link annotation

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