Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d11db8eee92f606…

MALICIOUS

PDF

66.5 KB Created: 2021-07-08 10:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52f458884d220b656c9f79eb9f3223d8 SHA-1: e99479aca9a9dafb144d8c1c3ff285324ac302cf SHA-256: 5d11db8eee92f606d567b9e79e2078e3e5b85f14c12c754ad59ae8ee7c8af335
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=a+to+z+mp3+video+songs+download+telugu PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a31f21d8d9---vikewuwijumoselijaluvo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a92a171ba81b3017e2a2ee99921df8c8/23212617875.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/kejaxikixutazal.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b858e1b0323c649dbb61cbdb92c93526/59838254946.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/bonepugobakomulizoxuvez.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/946563c9f8459c10043e3bdb54a99dd5/52910367033.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/bapoxubafulomexexag.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/43449aa134df7496f841ab1c8805f113/11407902634.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/58638996043.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/virejojogepakilapokiben.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/20000505324.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/65628c13ea57673561832889421fce23/fometop.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/18023964209.pdfIn PDF document text
    • https://ms02bet.com/contents//files/90113799116.pdfIn PDF document text
    • https://aspirans.com/files/file/vuwon.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/93135842135.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/kekonowosotiniwu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bacd3b950d8277edb918f4fad27fdf8a/fuzaxubabulagujiruko.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nanf8r97obl5fhl6as0jgd7343/77094971447.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b59701bf52d329b48744166528aba0e1/8947360316.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/82f57e5893a9f252e82a8719f8f41cae/faxogidajovo.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/6900265057.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/29142728921.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/babe498c7b1e5dd863ec3fe9c9cbb825/xemirabinurikukewoneri.pdfIn PDF document text
    • http://amajyuku.com/files/files/64698173653.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_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 16664 bytes
SHA-256: 172fe1f7a1bb060e95cdfeb1eddc62f9305b1f095c321a02f4a36c33a29e0a5e
font_01_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1