Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3776e3af5cd43d6…

MALICIOUS

PDF

87.3 KB Created: 2021-09-10 03:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d1b880ff47dbc5150f2c9be7311baf7 SHA-1: 4a69b6ce2a0c09a07979ec5427fab02d3428d6a4 SHA-256: e3776e3af5cd43d6729ed755215da795516489a65cd83006b68123a73da7ec56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

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://irlanc.ru/uplcv?utm_term=mario+kart+ds+characters+unlock PDF link annotation
    • https://dermatologie-francophone.com/userfiles/file/sarulokovuberejabozaj.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/29621678741.pdfIn PDF document text
    • https://ocw.tw/uploads/files/nisotipiz.pdfIn PDF document text
    • http://kelsenator.com/userimages/juzutapixujavabuzarope.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090308235416.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4f8c5ec7---bafibufe.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wuxaberopebomo.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/26419227944.pdfIn PDF document text
    • https://mlspoland.co/files/file/zabuxuwogezejale.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/2323027506.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/50620812c8a5b97329e2dfcd812626b7/13690909355.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/wonasonegakebudiledebe.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020018245637.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/99424581709.pdfIn PDF document text
    • https://ratosatu.com/contents/files/makexofajavigigatupo.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/67392673686.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369dde4473e---vuzerukasowarabiw.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/jimelonuwab.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/zulixavejidaxema.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/nofuvevafidilakivatet.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/92225861317.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/jumuwisudubifele.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/dureluraxixokusi.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/27763991679.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed15758503---josalo.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_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 17896 bytes
SHA-256: e5ffe70cf8a179b1c518989d63706bb53b84e83c5d12543415630426414c1d6e
font_01_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 10652 bytes
SHA-256: a15e983025cc2611417ee39f72f31bf4c80ae16e7075f71fedf7f737e89993df
font_02_sfnt_off000136e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1