Malicious PDF — malware analysis report

Static analysis result for SHA-256 f766c1ebf52cc04d…

MALICIOUS

PDF

297.3 KB Created: 2021-08-09 20:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ff587336b0f8903bbfb64f0c44344a4d SHA-1: 4b4134e66d615f5f011fe87760bde43d35694796 SHA-256: f766c1ebf52cc04dc6cf2d73e682a4d27887ad99b9393107a17bba5c26a0f306
214 Risk Score

Malware Insights

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

The file is a PDF that contains multiple external URLs, some hosted on compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'download button' lure and a 'password-protected archive' heuristic indicates an attempt to trick the user into downloading a payload. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests a command injection attempt, likely to download and execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9412

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=computer+architecture+and+organization+pdf+download PDF link annotation
    • http://datev.hu/ckfinder/userfiles/files/rexaziziruda.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c391244be0e---486580198.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9650c9ded31f526ad7012b78e499f4ed/movijiw.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/58729c6cb0f16b3fc7a57bd3b8190616/lagofotazifuwunazopunab.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/37563445634.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/tanikaxesemumoresa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/59925760475.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f1a6e205---mudojibawedufusimita.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/50459030933.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/91433716841.pdfIn PDF document text
    • https://brod-plovdiv.com/images/tumafenu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/40001820961.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/wexog.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/noxud.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/guposik.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0cd60209---18780969289.pdfIn PDF document text
    • https://norservis.com/files/files/31938649659.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/60698644761.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/95749394903.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/totigojigel.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_off00042bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42BB0 11176 bytes
SHA-256: 98df7b52a3610c623a26aa867732e58dd270eca9c6ff5e7ce887e0ed2dfa58a5
font_01_sfnt_off00044584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44584 20940 bytes
SHA-256: a6c9c309726182d39e7695d837d88d62e495286ad0bb287e52fa6290ad59bb18
font_02_sfnt_off00047db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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