Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c85cf482c4f4ea…

MALICIOUS

PDF

96.6 KB Created: 2021-06-10 13:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: edf7fa0860374c53a4e40fa798af3877 SHA-1: 918c4f1f92f6edbcb2c22f0838f6c43281575aba SHA-256: f5c85cf482c4f4ea02ef357c4e9502aa90352df168c820d6fed3ed31b503fd66
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing a browser extension or update, a common social engineering tactic. The numerous extracted URLs point to various compromised websites, likely used to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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 https://nomylo.ru/uplcv?utm_term=shiv+tandav+stotram+lyrics+in+odia PDF link annotation
    • https://irisapp.cn/uploadfiles/fckeditor/20210526/file/16220410805612.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/spdd7s0mpcv3vjscfvkesk9t06/jagegadevakelajalex.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9a76ce7827b9756b8a15d9e09173d760/3012818073.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/vomuguruzunegatofafot.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a6a32de629eaa24eed5b66256b9268dd/39613322723.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0dd130286---bumotuzi.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/nijod.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/64bf6366958352480744bdc485979e29/tizexami.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806725286b2---zakelisulazobetivapaf.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/rivotobuladi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d1a1eecc---dowenutabedumewan.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/selexutusalebadetexu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad29c2742---minamekatajopodipapa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75f365b06---62082735486.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094908fb17af---laxojoro.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001003c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1003C 8028 bytes
SHA-256: ae81754d632d23d51078a3327d32cf011485b08382503e48d520339366cc554a
font_00_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 5444 bytes
SHA-256: 50f8a5eb6f6c40bc61a3232fe3e4c020b6ec842d7e88b9fdeca59b3565ae753a
font_02_sfnt_off0001162a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_03_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 10896 bytes
SHA-256: 4ee7d0e6faca8ae998464aedb32d11c803026af3585af4092f7712d53d663955
font_04_sfnt_off00014708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14708 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61
font_05_sfnt_off00015c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0E 6904 bytes
SHA-256: 19bfef5e4606e6eaea0df291fe7ab8d121101146899d6ea192c8b7d2a3c28368

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