Malicious PDF — malware analysis report

Static analysis result for SHA-256 41684a0336f42ede…

MALICIOUS

PDF

56.6 KB Created: 2021-09-26 22:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 585b62b1a5bf416269cadb1f81e34cdf SHA-1: 6c4caa13ab470e12bd17ee64d30ba498036e7ed4 SHA-256: 41684a0336f42ede4a1bcbd4a75544b06512f7a99bc9baf6b36b27355bf42a41
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, some of which are compromised WordPress uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a link farm suggest an attempt to trick users into downloading software. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8195

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ecohost.ru/pics/images/file/65149987222.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141756ab5501---48848631465.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/laruzuteserixuv.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/36876593375.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/xululisipuxitekegof.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/43151547423.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/29279306261.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/kerina.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/pebapoduzu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/htg4njrneau16kkdhj6mpei4u2/gunepefetagizalixemobidan.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/88084236324.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/81ef4ea25b7f3b4a9c6abdc105db750c/xonava.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/vavepez.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/88995124851.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/14730029627.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xotonerib.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/67410548108.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/wiruted.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/8543166442.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/87843333684.pdfIn PDF document text
    • http://machin.kr/userData/board/file/96627824591.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/ralotapazizepojo.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210923_213114_186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=camscanner+download+for+windows+10PDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/98026543848.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB788 10832 bytes
SHA-256: 58101954c7c242c97834ac9c8b9e44ca7af610525cd3fdc8b13597fe196fe5b6

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