Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f065e3a781aade4…

MALICIOUS

PDF

91.5 KB Created: 2021-08-12 08:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a9a6c4d18032219b6d7e0d2165e6e35 SHA-1: 113cd4a20bbb272246d372e1f69b02f98a3acf42 SHA-256: 4f065e3a781aade4eeaf73f8892526c8d016c0bc40ae7caa4914925ff8dac371
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and embedded content are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4237

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=las+venas+abiertas+de+am%C3%A9rica+latina+resumen+cap%C3%ADtulo+4 PDF link annotation
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fdc2a14fdeb27494079de73c820124ce/ragunugagutenipafexuj.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1cikrt3em6seomtgd9c4hnqf1t/rafolifexubin.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5befacc0f80a516ea1607d72dbcd6849/wopeborinofuf.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/fd43fb100cf614f0e3699f11a6044526/16326660872.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609f545c34ca8---31457933391.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/5533632635.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/10913285541.pdfIn PDF document text
    • http://info56.ru/userfiles/file/54224551966.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/kipadiluxun.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ad7b0f92c944d3316d5d15343931b3cd/36556112024.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd861392c79---51300028981.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/kasubegogabatuzo.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/37019250119.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/zoxosabiwe.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/6def4ba230e719d6aa538e57cb5d3a89/39261145554.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/vesodoxinuboz.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/lenamoxopajowosu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b2sakp8s73j8h40mg46lohdsce/fumelorizu.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/dalemu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aae21258fb2---doxomubiwakalito.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607928a74cd80---kidizubopaxopasot.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/gisobowivinuta.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/19879612392.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/t8iev15p2mvdcl6bgnob3dq8re/39271979099.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09725e5c7---jigaduba.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/legidazisisogugivizurisag.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14927 17588 bytes
SHA-256: 2cc66c8405b6e7e2e517fb7fbe2ee5f5123ce66912c787589efcede494935b49