Malicious PDF — malware analysis report

Static analysis result for SHA-256 737749b632559570…

MALICIOUS

PDF

67.1 KB Created: 2021-09-18 18:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38cdb681f33517f373030c24fa6904bd SHA-1: 976c0ffcabd3ef3131da86708f38347cd853d9b2 SHA-256: 737749b632559570e9d372a0228ce3776da44183156a769122c903186dce1b9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage search engine optimization and compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://nomylo.ru/uplcv?utm_term=what+can+you+make+with+nether+brick PDF link annotation
    • https://asiantms.com/ckfinder/userfiles/files/faxebuzigox.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8dcaf712---kaniveporanemabix.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xotukoramar.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/foxamakojib.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nilexu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77a374920---dubanomenu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a5e18c3a---xefafi.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/lixigedanejifisawunup.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0cbf050b4---zemimojiwitidoluvif.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/62698452086.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/69557252747.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/bovakakasazibuge.pdfIn PDF document text
    • http://chapelguild.com/images/usr/bawasakuloruj.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/puzakavi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6eba44d0a---tezevin.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/20377982999.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/popegenunujod.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/24682636215.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/xavikizilivufubekutujuvu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614232891c126---36203492207.pdfIn PDF document text
    • https://trystsalonri.com/images/file/45156318962.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/xewewidedo.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/dopelamized.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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 16220 bytes
SHA-256: 74ef257e81a56428d468c9bb9280d0237feac066729f9ff29c73acab13fd2005

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