Malicious PDF — malware analysis report

Static analysis result for SHA-256 399720c1a62d98e4…

MALICIOUS

PDF

63.6 KB Created: 2021-09-22 09:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3735d0ffa67b603b136e1db2165f28bd SHA-1: 50bfb3fd91057e29ab20dcc800626aafdb07f9bc SHA-256: 399720c1a62d98e4f7a89e2adfafa3c206552954b66043d46a22d6e7fc3e6933
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6403

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=amazfit+bip+s+watch+faces+ios PDF link annotation
    • https://vildmarksjagt.dk/userfiles/file/likexitupenovanuzus.pdfIn PDF document text
    • https://mbbs.hr/files/gimirim.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/bunimakasixopub.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4417ad9ea25556189e1a5650285360a9/96489576710.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39542308470.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a4771821f57db645fd53354cc4372c85/tosupitutone.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/viwosodekemexitisib.pdfIn PDF document text
    • http://nfc.soo.jp/file/manunebovovun.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/duxumavon.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a7c6b032e---83415855071.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/c5lmb4ofskr0tvaa6pds93cjk0/sogiwajifibibomotixun.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/39112364869.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/2475989202.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/87f09rmkor0p5r8jpug6r7ku4n/xutorejagemokig.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/pifufovevezexavag.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ovl4plsih6n99aek8en0gss2n2/ligomowewi.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/fogadiruzixem.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/27391260363.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/mibejotumebokasobesi.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/vuwavegotonazawagekuvolud.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/07/ruxafu.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/89514408432.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/94219695894.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewolodopuveferu.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/24000014946.pdfIn PDF document text

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