Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7c83efe3e8c3f3…

MALICIOUS

PDF

79.0 KB Created: 2021-07-07 04:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56fb373f04f8a8e78dfcf8f8f2b1884c SHA-1: 2928ddc36f990040e37b26a4bf80c0d0456ae3a1 SHA-256: 4a7c83efe3e8c3f383bac1f4ac6a6287e93aa83395a59aff8d79dd049f8f8a18
124 Risk Score

Malware Insights

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

The file is detected as a PDF phishing trojan by ClamAV. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious content, such as phishing pages or malware downloads. The PDF itself contains obfuscated content, but the primary malicious function is the distribution of external links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3268

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 http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fd63388d---66290853461.pdf
    • http://capmar.eu/userfiles/file/10811511357.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/13bf1ec92d47c6ef1b9770aee79f66bf/86082382459.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9180a49e656ae7a09d0cc3af358fd573/zadivovimomewe.pdf
    • http://ekolojikweb.net/upld/userfiles/file/72110646844.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070086e4ec60---xupup.pdf
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/zurupifimapikeleko.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/60ea0491d23f54d2c4848da24dce2fd8/8762251992.pdf
    • https://stvorki.ru/files/file/55945055314.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c055924d2---15588243974.pdf
    • https://damiel.eu/userfiles/file/vivuliwatogeluwodu.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8822cd5efaa9c405ebc0ab69ab470a1b/42550218643.pdf
    • http://cuboni.com/uploadfile/hong202106221734143207.pdf
    • http://thevisionkharj.com/userfiles/files/82758039597.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/tapuzazugigawog.pdf
    • http://myblindz.com/fck_user_files/file/vixinekelebosedov.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cf463c77a2b777223ea335b408a88c93/99004924932.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c62267025---bobasuvejovefojonuw.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5aac8dcfe5967b7e6dae48c6b4618fb9/5595205679.pdf
    • http://vidol.nl/userfiles/file/zinamijodugukogazaror.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/uhjfnacdm2s0gdttukg3uoecb1/zoregufedapituz.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160864d04647da---xapasaxatajojudumo.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a69ed53f2e---76463539898.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/rtsi5ltgoos9esfd6eirsgkrj2/dezup.pdf
    • http://enjoy.sk/editor_uploads/system/files/wufukapefekovoxezi.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/70um2errjdf8dqd1pglkt6uh30/fireruwilotugifiwewe.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c857329e63---74177486241.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+meaning+of+bidding

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