Malicious PDF — malware analysis report

Static analysis result for SHA-256 876453320b6a6ecb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 03:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85afac530ffd4e9dcc87d799cfd60b7d SHA-1: 546f574b8a5e9ce82ffbfc843ccdeacbd9f66b7b SHA-256: 876453320b6a6ecb66028f35efcd1d4d2e05b2600d1e589902a8d82bd14e8eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites hosting further PDF files. Heuristics indicate this is a link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=yts+online+movie+stream PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7df7d88b353fd463dcb30dd61fcebe5b/88007882621.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/rujepowobajuzapagaxufu.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/tosaxuvoxefoge.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b450e0ef56---pediro.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/80681877716.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/28149383834.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210913032016.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/31662542511.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/dowolajibapowo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/82dee2deb20ae94b3bba699fc1b84721/xuxinetumigal.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/laruwonizorilorawudu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132280ba9783---90868114568.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qjt1b993796nppee4rue6ufo2c/47878673469.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137f53b4ebff---rifaz.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/87446897905.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/25975450779.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/57306195486.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///22221104350.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/bonase.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/66484377962.pdfIn PDF document text
    • https://jagominum.com/contents/files/dubexegorususilikukegu.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/83911828255.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/rukaxowoduzojitozur.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/zolika.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/kewafubofuj.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_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 17188 bytes
SHA-256: d6d36c6c6fc3b4d86cdd526f27faf0eb283ef931bf31ed8e13bdaa9a8f1f769e
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 10320 bytes
SHA-256: a26f842e04973dd2e29585a53f55027fb216a14a38c49f8dc9427426fe4a3c1f