Malicious PDF — malware analysis report

Static analysis result for SHA-256 2521b7c909fc75dd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 13:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cab594309a9bd86678913e167a93945 SHA-1: 3579f323d302a3d1abe4e3a7b764d8c97ca7a3dc SHA-256: 2521b7c909fc75ddd37645fc13eec458ed5ceb95435cb140bde4f3bc5927fd75
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests it points to compromised WordPress sites. These elements strongly suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://budka39.ru/files/32314168774.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134138e202fd---82336089618.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/wepulu.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/simaganufajopereseg.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/kewivuw.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/zowirokapanuj.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zetekudifo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131435793dc8---supuwekoto.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/23573343568.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/walawamelujetovepa.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/25511981650.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/dudutikebepiwelar.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7b596bb8591fb4a7c5e723157c9dbf6d/67774835350.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/jumonelenutezoxonife.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/silol.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/13479240860.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/jupapolisexenuzusijezopes.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/gizipojidarasuxuw.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/26127882666.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/loweponepa.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/78966802050.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/03/manexusumofo.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/95642818185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=relative+atomic+mass+of+isotopes+worksheetPDF link annotation
    • 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_off0000bf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6C 10928 bytes
SHA-256: db644268098ce0f9887fd4a209183244e79ccbd27a5f078a8d22209bfeae5e7b
font_01_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 17572 bytes
SHA-256: ff0d0d2e79fd1c4e351fd3833c58d07b177cf68fa5e13fe9fcb77c265064b322
font_02_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.