Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ba8d0fb5ce7e2d…

MALICIOUS

PDF

87.8 KB Created: 2021-08-09 06:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 387f4d002a4bf387234058008e9fadad SHA-1: 3a8f0d1868baa4844fed6ab94346636f05bd356d SHA-256: 24ba8d0fb5ce7e2d0250ea7eee21a81ac55314be215c9908e59e1c1cf99ac2f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads 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 distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://k-ookuma.com/js/upload/files/gopupetovazarusibufuzinav.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/85181e96172adaf88187e30fde11525a/21920714480.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wotonotawijemabapisir.pdfIn PDF document text
    • http://centronegozi.com/public/28668096623.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/31181439684.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cbc294d97f2bc0e142cdf85d0ab976d/lijor.pdfIn PDF document text
    • https://rinducm1.com/contents//files/xodixadabizixek.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/70878813367.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/gutufanisexozunuxoserik.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/pewabetofupupon.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/9drprvgh9pi60kovnhrhhjr923/xiworid.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021071920294073499.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1d13bc81---bevikunubiza.pdfIn PDF document text
    • http://firegallery.ru/img/upload/wibuvedobutejusute.pdfIn PDF document text
    • https://kaisar168.com/contents//files/821365156.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/75330708722.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610135ed38b95---18435144307.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/65213994698.pdfIn PDF document text
    • https://buka.ru/sadm_files/46595022105.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/vajoloruxa.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4a78657849bd9a7602dd0c3a12e47251/dudabovofu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53c923e666---nekulipulemelalewi.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/monigaxepefo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5263bd27f99fab791bfa1a3606ce8ea5/rifilajupavavovigekiji.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16079139aa2db7---20228444946.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/uaed3vir5e3e1jnbk4t6gjdic9/getafodalevizabitageboto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=descriptive+survey+research+method+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 11016 bytes
SHA-256: a779f9f09685672891325eab5ea0e2b60d3c42eccaa866a78060ee1e688ac9d2
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 16332 bytes
SHA-256: 0bec9dbd09d777ebe811d924d3eec7eb63ea69faaa5d84dd2df36ba3a88e94b0

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