Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd192e1885350366…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 01:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cc403113382cb4b6162b80c396ddb220 SHA-1: 948e5312f13351cdf8442e4f2b21971e026eaa42 SHA-256: cd192e1885350366158c481e8b101214b1bfd89d7396fca63c54eea08cb184d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=come+impostare+browser+predefinito+android PDF link annotation
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94c375239---vililufudaworokomemixo.pdfIn PDF document text
    • http://peoplefoster.com/pliki/65310840517.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/55303747271.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/98875831103.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/45508588328.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/45991709030.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/bepone.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/vemugemiwakejoxig.pdfIn PDF document text
    • http://lyshiying.com/d/files/bumesu.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630834987577139934.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/nikanulaveboworateje.pdfIn PDF document text
    • http://nscenter.cn/upload/files/31352386962.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/25bd2f2f25d375294de67017f71f8586/fanadezufifitirus.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kuselamoxafojedolividanin.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/29693531417.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/liruxoluzinokixi.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/54389666397.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/gitagisa.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/zuxorelejubijabimejovim.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/begatijuloxe.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b39a08c3f---20069197574.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/2847505909.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210903_FD29B068B32F9F0C.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/vebozigedidopega.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/43964224534.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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 10868 bytes
SHA-256: 867da1fdc89d61ac89eadb38c269b67aa6ea42d8f5bf6b465da930e15b73b8d4
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 19012 bytes
SHA-256: f4aefec2cdc1979c10ed8e132306370d1a9091a3f270c4a9823deee2b23f94e6
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1