Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e0ccc72ed8bc5c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 13:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e0c61a92b25fec4cf7eed28e7a87876 SHA-1: 22989fd9ce86315cf94bdd4f0a0b00616ce633bc SHA-256: 67e0ccc72ed8bc5c49caa2a68e2d3e0c5e1a50c00862329284a232b1e2b76526
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://dakov.hu/_user/file/sufejogitopuv.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3edc989ed---98317996299.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/gasoninagogoxulejalibeze.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/bozizusawawu.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/82568158200.pdfIn PDF document text
    • https://seger.cz/userfiles/file/fagibajituwut.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/68661766082.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/tugekexamokimirat.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/redadomisikijej.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/67s9fota5vfe664mfcr9oq381i/fafigi.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/29740652776.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/komeg.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9628195962968cb5a53e27d4697eabbb.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/55048018539.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/tagez.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8a58e7dc---51602559808.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/48208312971.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/21060560991.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/gufibefidaditepikuleniwo.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/vevavazupumizowod.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/xesunemozogabofileso.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/wawaxawipuwojubo.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/miraxekal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ad+free+android+file+managerPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 10412 bytes
SHA-256: 78b1a5e3c7362deaef538508b0dcd7eb3a214492ef38cdc7302044737f30b427
font_02_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 17948 bytes
SHA-256: b4c110fb9c78b0e2f3d2f5978635692a17d20a809284b195f29bf8cd853ebd23

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