Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa237e9bfa00a29…

MALICIOUS

PDF

66.4 KB Created: 2021-09-19 19:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2bd36db0f6c5c3906ddb3adaaed98c86 SHA-1: 938feb707b9469077033b9b2ff13315d36769c75 SHA-256: 0fa237e9bfa00a292da27e17d83036c0267f7519558922533b7c456478afea4d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7151

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 http://radiosalsa.fr/php/rs/filesupload/file/96028091832.pdf In PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/39494160059.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/73995506814.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/36537058746.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090314474942.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/xujogagixanupum.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/26384336537.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/xiwevuxodubujex.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147108e10374---65830728400.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614214fbcedbf---zelagukamipuxasuzotusodig.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/35916999342.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210905_203149.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/nafewiwiwanidamoniwupuj.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/xiwikatujoriruvawugowug.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210909_97A8A3B1A5A11A7C.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/lujowuxenidalobivebut.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/29729000112.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/51086933034.pdfIn PDF document text
    • https://mbbs.hr/files/pilupax.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/24372458522.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/goxasugulo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9e2d32e2d1a434b5a552db8dbe6bf400/tigafivubibupijix.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/48387515813.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/28321168922.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/61151933328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wcc+mod+apkPDF link annotation
    • 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_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 10020 bytes
SHA-256: aad06fa85e94d6b8e01472128ac30bdece3d7ecd2cc3a2983c2d7baa14f1e9ea

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