Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0bac4dbcb75218…

MALICIOUS

PDF

62.3 KB Created: 2021-09-10 12:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04b04df0e787d5ae6eab8295216f1d08 SHA-1: ee0b3bdb63e188c0246d7c0f71e0a891d33d670d SHA-256: 9c0bac4dbcb75218e9778f871d4f05347c7650a2a7df5de1132c541dd9b8c9ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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://prodottoitalia.eu/userfiles/files/58191517532.pdf In PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/27002652239.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109051608069697.pdfIn PDF document text
    • https://kueapem.com/contents/files/41394459785.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613272ccad7b5---32610468741.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/81297252834.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210905file///50576276490.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/83649895997.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109100337274054.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/jibufo.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/8421900694.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/donogoz.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/48519003355.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/35100027435.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/27872541503.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/85816697707.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikirubavex.pdfIn PDF document text
    • http://jaatkinson.com/userimages/desazuseke.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/fidupev.pdfIn PDF document text
    • http://ebus.cn/up_file/file/mabevipiroxepawafog.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/jofat.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613431897b4d2---21985039231.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf43ad431---pedenulosisuwow.pdfIn PDF document text
    • https://jss-moms.si/upload/File/reverebajexatede.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/jasotoleboxefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ipad+pro+2020+pakistanPDF 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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