Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3249f2ffe747740…

MALICIOUS

PDF

81.8 KB Created: 2021-10-05 01:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f815153ee9a0ab141064d9801bff6da SHA-1: f30f98ca917d5e159dd96094aa4c67e0fd60b4c0 SHA-256: d3249f2ffe7477401bec3d9a72de73ff02bc86eec59d7302634debd02cc6b866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristics suggest the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=finding+oversold+stocks PDF link annotation
    • http://m3hotels.com/userfiles/file/54644924258.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/nilosujagugodizugaxe.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/98042792391.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/47711662053.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5pi60ofgrd8rs6f4osipm0ib5r/84019812696.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/57412290087.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef00ec6b4f---linezowozaz.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/66732412175.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109080619325931.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/bumejom.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85386173172.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021093020070373499.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/rejebubofewekulimajebagu.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/joxigorewuneja.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/wusunumagimoru.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/67100088422.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/73327137660.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/20963708173.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16148f9cf86ece---karexuvitirulunogise.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/taniwazogi.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/lemakiwunifegomemolubageg.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1bfce5b65a4c4672eff721c3b3dcc13d/31057231745.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_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 17496 bytes
SHA-256: 6c3aab22fa1847d9a0e2f4be31fc4370eb7244beef766c85748fe168354ebbbc
font_01_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 10520 bytes
SHA-256: a2fc4df08c08f26b4296c8d676b1b0a594ee6a31f8ef69f6c3f1f20392e3a677
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1