Malicious PDF — malware analysis report

Heuristics 8

• 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
  PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
• 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
• Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
  The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
• 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://chcial.ru/uplcv?utm_term=linux+run+android+apps PDF link annotation

  • https://www.tunnel.de/files/uploaded/file/xopasel.pdfIn PDF document text
  • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/letadefonopes.pdfIn PDF document text
  • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135cce65cc19---fumexisenuvisizitimelelow.pdfIn PDF document text
  • https://cjsc.se/ckfinder/userfiles/files/woror.pdfIn PDF document text
  • https://kenkochaya.com/user_data/ckfinder/files/55237400631.pdfIn PDF document text
  • http://ipai-bg.eu/img/file/mowetazod.pdfIn PDF document text
  • https://szpital-sulecin.pl/images/fckfiles/file/10736089770.pdfIn PDF document text
  • https://plantbiochem.com/ckfinder/userfiles/files/32369969902.pdfIn PDF document text
  • http://promocode.lu/userfiles/files/ginivefufajigexoxipowuwa.pdfIn PDF document text
  • http://uktohabbarijamalta.com/files/file/16768091294.pdfIn PDF document text
  • http://constantemails.com/userfiles/file/163062402771067832024.pdfIn PDF document text
  • http://studiomedicoveterinariobellucci.eu/userfiles/files/wodezigilafiwugonukotup.pdfIn PDF document text
  • http://terwaarde.be/ckfinder/userfiles/files/30018513195.pdfIn PDF document text
  • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28c0b3631---80047482854.pdfIn PDF document text
  • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ddc8999f3ab21ac8b06806ee7176586f/68645292894.pdfIn PDF document text
  • http://aytekinpolatel.com/image/files/55688452840.pdfIn PDF document text
  • http://prosquash.by/data/togebegunumuwami.pdfIn PDF document text
  • http://hifitness.hu/userfiles/file/95648969395.pdfIn PDF document text
  • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fae5f48d13---40932914158.pdfIn PDF document text
  • http://jan-fotografie.nl/upload/files/tisidanadewox.pdfIn PDF document text
  • http://dpholding.ru/uploads/files/zaxagabatigeputinura.pdfIn PDF document text
  • http://staropolski.net/Upload/file/masuzanuwadutob.pdfIn PDF document text
  • http://kantoromega.pl/userfiles/file/93589085030.pdfIn PDF document text
  • https://4cmedica.com/ficheiros_upload/file/7098286861.pdfIn PDF document text
  • http://colorfulmedia.de/fotki/fotki/file/zozuwopinisojodusevev.pdfIn PDF document text
  • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
  • http://purl.org/dc/elements/1.1/In PDF document text
  • http://ns.adobe.com/pdf/1.3/In PDF document text
  • http://ns.adobe.com/xap/1.0/In PDF document text
  • http://ns.adobe.com/xap/1.0/mm/In PDF document text
  • http://ns.adobe.com/xap/1.0/rights/In PDF document text
  • http://dejavu.sourceforge.netIn PDF document text
  • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

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