Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac61175605a81e78…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 13:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a3fb946513a6f6f9975f26c14bd685b SHA-1: c3ef89b15976a5db31c3d13e513032b01a345b35 SHA-256: ac61175605a81e7834cd294d61b903e38c20e3f9474689eece4ba54cd139d76e
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'Browser extension / update installation lure' heuristic. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or downloads. The ML classifier also flagged this PDF as malicious, supporting the phishing and potential malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=run+hide+fight+movie+online PDF link annotation
    • http://evolutionchonburi.com/userfiles/files/31608653720.pdfIn PDF document text
    • http://keacg.com/upload/files/99129786094.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/59708511263.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/61944247455.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/gajowozonapuvinozul.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/wisudusuzifeloxunipowev.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8d22d28340aa8aa80044602609a956d9/sitojimanumokomezaxexal.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/linanexavuzirituzobijixuw.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/mirufulu.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/zosefidoxilotawomud.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/57357658610.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6db6cb876c637e08d8addf0716891322/zifefake.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/46249100813.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/52009218310.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/14911112813.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/3231705893.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/karatokofo.pdfIn PDF document text
    • http://boki.hu/editor_up/56349026343.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb511781bc---75835033438.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/41508285917.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///60146920680.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_off0000bf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 17512 bytes
SHA-256: 11e563a98a750e69bd21c148c74c0c480b982997a2405d5bc6ec9e1c261b2e6b
font_02_sfnt_off000104d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 10584 bytes
SHA-256: 3abc640c273fa019f19c2fa1335a4458b2eecc458ed5f850da27f53f4e486479

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