Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea904eed6f97a6a4…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 02:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef403ae5131939e05c278560669779e4 SHA-1: 9a1fe814fab76848e2e42af8e66bb47a4dd5b58d SHA-256: ea904eed6f97a6a441d854c163ce06310290e153e8aa029cf896257a2ee75b3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • 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://nibrasimansch.com/userfiles/files/rekidikulem.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/dc3234cf682dced55c07636539c29831/68767489130.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/podobikoluvoxalabunij.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c64e76a4830---57478608236.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a833e4a4b9---jovarujisidum.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8cf420eaa16de92ec0ed866e853fb60b/34027588476.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/goxagu.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/jidilexaz.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/2771143445.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a76004cc4---nikijipulezorezepotezo.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nareper.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d4856cb63---38272494119.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611004c47df82---30658422430.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a879e86b506---30513576236.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160739b04a41a9---21915861468.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ac254b5297ec329a52e8fa1ab5585d4b/71640624468.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/12711223309.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab210da0bc3---jajixopaxabujamaror.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/41t88jbf13glb87feqc59n2rf2/67226563323.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/jorifazeder.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/mademegowuzovutepova.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/73950078045.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/88409195554.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/92905213133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bible+message+malayalam+pdfPDF link annotation
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 16500 bytes
SHA-256: e86af23e0b02045a9bc281dba257d31e97eb2d5c8ee0f31a5ae3ba5f60c43586
font_01_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 10724 bytes
SHA-256: 2849fcd6cefacd1a07177adb07800b9e174d5ae4f51c2149c38989f331fe7b97
font_03_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 22368 bytes
SHA-256: 8f49052299739aa9433352f587b99e1cd80d8c8dcb3e00bdf09c826346fae384

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