Malicious PDF — malware analysis report

Static analysis result for SHA-256 229f21e7636bfede…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 00:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d39b611d1471fa984b02c13c3275b0a0 SHA-1: ac3fce36f00f9ac9e2d756bafd39dd0b0dc36694 SHA-256: 229f21e7636bfede760e3a449381c0020587c3b2e1100b6f398630a0455a9f04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=qureka+pro+hack PDF link annotation
    • http://alltechsro.cz/files/dinimuxejez.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/wuzapufuge.pdfIn PDF document text
    • http://jump360.co/upload/files/20210917131009.pdfIn PDF document text
    • http://belniig.by/public/file/36010086732.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kuvezajep.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/64106625706.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/lobovanulifojew.pdfIn PDF document text
    • http://strategieb2b.ca/userfiles/file/78106247956.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/letimedazejidegi.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/tabetemajejotezutitena.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/gavutopowunokif.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bfb0a01792d20d39dcd5fbc0e33ce53b/vosebizewele.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16138076a1525d---rifuxujodub.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161324895d63ae---xometoxiwutowupujena.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/nibazonunusovekunezetani.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/37634215657.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/tapajekupos.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/xaguwubofi.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/40228296487.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/wigovuwozavonukurub.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/mipujuvusatewozebuf.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_off0000d054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 19988 bytes
SHA-256: 0571452ba3709e5c0c7e49485ac211d62ed9aca72d7ca6156122b82eafef9837
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 10216 bytes
SHA-256: 0afae506f9d080cf030e4968c6031093747393e02fec5bee3eca4af5302e51ce