Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8f1599663cea29…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 20:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68d74ddbd32909728d85ff6be4ad5ffb SHA-1: d85f35d64ee34c207b574a3d21d14042627bdda6 SHA-256: 8b8f1599663cea2930ac710c4a00395a927d6b07c8f216346ed9bed0e972a3f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=charter+party+terms+pdf PDF link annotation
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1c8d4cd5a222f58ce35d955b76bb4927/56623631620.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/67198505246.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/zutetamowedovinonexexoboz.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf27332424---jamupolog.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b35fd7a3d43---47836826223.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b97e909d602---29520648729.pdfIn PDF document text
    • https://razredna-nastava.net/files/28550049808.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b219b3c70---besabovofisowuxavite.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/3e0fee8f9aaed45dd5cd24cf5ea07d45/fonoxudeduwalawel.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78299d832e---fivewe.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611632cbdde85---zoxenevof.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/jexumofukuwanujajewonukuv.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/17051623405.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/11252460429.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a1fd13cc6a507459ef7676c78d2a8232/diwokubenutuzinir.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca3fb1de2---99392240795.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/nenulokopajaro.pdfIn PDF document text
    • http://phpiratesbooster.com/clients/867602/File/33635427094.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/77388711651.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/42094f88f4d27b5ba037fd151e1fa47c/45244347127.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/64676133929.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/190084614b6b6e6035caa149a355ad4d/fizazuvobe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf044b25b---1232640314.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/pitiradivevesu.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/juxufako.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 10548 bytes
SHA-256: a7cc5707d4311198ffc59912fee136de78367a6a03a1b0bb023d9ca25d970507
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 18336 bytes
SHA-256: 600fb93d8e20c1c61edaf6a461067b92d322c67fb9a2be5fb1cbb5dcb842f77d
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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