Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9985fac8027af4…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 03:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 926b2598ee1ad49c6bccc644804cb15a SHA-1: 8d676eabf172a718695b1d121e83ebc5505b19b3 SHA-256: 2c9985fac8027af4373f490a064cee397ad99ef4b26545de7320794c8cbdd62c
154 Risk Score

Malware Insights

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

The PDF file 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 for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7354

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://savaksangida.com/resimler/files/7055950894.pdf In PDF document text
    • http://kipia-nn.ru/userfiles/file/62354094794.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/cjv355f9k0fb9cgjbqsanfjde3/nusodefa.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/24519439723.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/21597428539.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/17598848386.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/34334254975.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tujitojipozinebiveveje.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/4714959135.pdfIn PDF document text
    • http://ebus.cn/up_file/file/74244477440.pdfIn PDF document text
    • http://synhbio.com/upload/files/68146774871.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/fuzelelova.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/weseralerakisotobatog.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/41552596330.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/99091368211.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fupewin.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161410ed0dc4ff---mazuvaniropevezuzozaxubo.pdfIn PDF document text
    • https://medius.sk/userfiles/file/55236591654.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410db40d397---67276998333.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903064818.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/97034809565.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/11718073433.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c26983fac---bojinafu.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/jikibotirimewemov.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/75426083828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=highly+compressed+ppsspp+games+under+100mbPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 17464 bytes
SHA-256: 52a067521304766340dd1204d9a09ccf4e652d398152a8ee1e859b818e3c410f
font_01_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1