Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb236972a25a9d3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 17:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c19643872d678245f32c867878d6990a SHA-1: 65020b5e55c1351ea4ae4dc6e9336e29a3d75f61 SHA-256: 3eb236972a25a9d3ca66996a72d52eec5d33bc034ed31646554b9fa1e2b2c911
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 or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute phishing content or malware. The embedded JavaScript, while not fully detailed, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=gender+in+macbeth+analysis+pdf PDF link annotation
    • http://france-ex.com/images/blog//file/pogonodebipipepetos.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/34771352042.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e43344ca40e1688fe1a5f608de60e450/52261058965.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/27120813080.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/todusagurawar.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/18f6cfd4bfac81979c073aa0aad2d292/31576162040.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/sanutudad.pdfIn PDF document text
    • http://kaies.cn/upfiles/2105252101167382320vyo62.pdfIn PDF document text
    • https://efnnma.org/files/file/xusoteb.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/18/91780577697.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/butuwesejedi.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/xuwutox.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210714163058.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a5735a6d---gurevegokisoramofopolu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qh1d9if6co6tcf4p9icla89qg9/94662513548.pdfIn PDF document text
    • http://fructusartis.com/i/File/berebipunoletusugorakef.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/rurubutofevadexepatezase.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607232b0ad87e---6742752425.pdfIn PDF document text
    • http://yanartextil.com/firma/files/makujiwefepesuzotitar.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/3656527501.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/zetowup.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/94622641966.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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 17824 bytes
SHA-256: 1845cd08abde8bece56f680ceb05043dfc751c01c248d9a7bd02cd6c8fde2cdb
font_01_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 11056 bytes
SHA-256: fb870bd67baa0f8b2e955d310b414f91c786bb4a0786aef573fee977fc482673