Malicious PDF — malware analysis report

Static analysis result for SHA-256 f466e9868d7d801b…

MALICIOUS

PDF

74.7 KB Created: 2021-10-02 14:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8b9d75ddfccce1a0bff53a784f31b941 SHA-1: b1f9706475efff2215b51cc692301b422aacec44 SHA-256: f466e9868d7d801bc538b383ff10fb682a67b966e64197f34d64631907495a75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to lead users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=honey+you+are+my+shining+star+by+the+manhattans PDF link annotation
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/51133975213.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/dibofefitujowitifosal.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/33804875039.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kupuruvejumibusoxi.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/fupodilopikuzepamakepixed.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c948b8e2b---kimopasumapupufuxoli.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/53557431537.pdfIn PDF document text
    • http://chinahongji.com/d/files/nakej.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/wejul.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/73079358115.pdfIn PDF document text
    • https://projetovm.com/uploads/files/85162856173.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/818810294ac93b9036271c95e3b8db34/73123876675.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/61830188795.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/gepoxejugikerozo.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/vajevuxip.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/52776506010.pdfIn PDF document text
    • https://babycloud.ro/app/webroot/files/userfiles/files/9739882472.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/lobuvimebikijalurig.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161439d50a5a48---gutogopudukas.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/59400060135.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/muzolisipusak.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7d0154d65b0baed8ab746bbe43af7d61/56842621719.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c80d18b87f---26991030862.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/80115960996.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109090537405127.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_off0000bf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 17676 bytes
SHA-256: 7ae8542e8efc779bfe165b10011c6b9c7b24b2fa3f1a21281d988d35affd0414
font_02_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 10852 bytes
SHA-256: 2d0baf9a74461f8c47ec727df34d75927e70ebada9472ff69a63867ac60827f3