Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b28289e9265c3bb…

MALICIOUS

PDF

82.6 KB Created: 2021-08-17 11:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2de235d35ef8dcb656f8bd0e8f7dcbd0 SHA-1: fc2e353c1965e4b5b41ac2f133acbb292d37c261 SHA-256: 8b28289e9265c3bb81fee0404de11b90ccb2e0f34953d9f2fe0a1c2342f23602
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware installation. The document contains numerous links to potentially compromised websites, suggesting it may download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/werazetegagopasoje.pdf In PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/33487757827.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0747a68e8---fagevowedumige.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec57b61d82---68262247410.pdfIn PDF document text
    • http://kme-kme.cz/files/file/89024336129.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/jitiditi.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/91556636448.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/49357980428.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/65207094096.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/wiwabanek.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba584817d74---jusetogilog.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b693edc5d---fuwaneniwuxekumobudase.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdee10826b---bajunuf.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b8cfcb10f---vujomu.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/37615915534.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/18924616094.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/pirodilepojazodafegapi.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/11851233012.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/19279851601.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aa944d2b39b6f8044158c5fb1b04b49d/gokeziv.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a497796f1e---ranogubumapuvomifaremeru.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/3430702344.pdfIn PDF document text
    • http://chayka-svg.ru/files/jifutami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=can+you+request+a+specific+driver+with+lyftPDF 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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 11260 bytes
SHA-256: 8c290f5b7c11b87a404e7c6522dfbbffae9c3e6140e45152368e38668f6d6b64
font_02_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16780 bytes
SHA-256: 809fb3fd948e5296f1e4d0bb92f1e414acab30dc6383bbfb34fb577ad96443aa