Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ad542dd6cb3916…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 09:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b30d5c9d877379e05a3a0c71f2cd45fa SHA-1: 45aad4be7e46b39840b6bcb05549414cc269a1df SHA-256: 95ad542dd6cb391621f5b15431802ecc94989aafcdb750fb6e83180d0a045b70
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9257

Heuristics 6

  • 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.
  • 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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081620d6b25b---waxopuzanegiguritonerawo.pdf In PDF document text
    • https://tecnicadovolante.com/images/file/98134720165.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/xogaro.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-8/file/LwpCms2021_08_30_08_55_20_9501.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/33186016529.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/3393332827.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/9f1fee195d9043e8839ee3059f512de9/67551016594.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/rufobunukagofuvirir.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d8906e560---fudoroz.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/14545419562.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/gisoz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6cb97a8087bb324a27be973b14fa549b/rurifunekiduvaxowada.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/vafuvojubemiwarunir.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108251352239121.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca954f0e1---75936713065.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/717235a22f13ddc434efb850fee3c5f6/lisarezabukomixodatanuto.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/35441172835.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072629a0ee2d---51236116663.pdfIn PDF document text
    • https://sce.tw/uploads/files/60f4a5dd117c4.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1c8adq3c64ggodg055baork8i2/16539870951.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abce426514e---bumuvedegakujazul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+divide+in+polynomialsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 10708 bytes
SHA-256: 7bebeb9f69a709e2e46ac0c5d1ba8d243dc2fa10140b12a6851e17b4890f9599
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 17020 bytes
SHA-256: d22f88cd97187fa47c30b25db50dc7556d3a503aeb8a04b15526f57c7186221d