Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ea4ee0067f999a…

MALICIOUS

PDF

65.4 KB Created: 2021-10-04 06:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9aa8c8ff7eff31192289ff4e3bcf66f7 SHA-1: a1929df8b852c71f4682f551301946000ca719c8 SHA-256: c0ea4ee0067f999afa0e765ca4a572a2f316d5de16466a70c1e927f5010d5b26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection and heuristic firings indicate this PDF is likely used for phishing or to distribute malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4280

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://wisestudentz.com/userfiles/file/xapowajutajunufewujemoru.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eedcf6d716---54709663328.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/160416224108.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/34887018663.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/pozozutoz.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/86815914024.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/benemabituregefolopuwoted.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/zisumajetufudugikipur.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pegavolizudulakunugikiz.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152db620a5fa---92123603341.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/gonajepet.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/5683588496.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/winajileguwakuj.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/35018106585.pdfIn PDF document text
    • http://gibisch.info/files/files/wabavasogumubonolixi.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/puvezo.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/vemim.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/zatapejex.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/48158911412.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f6f93170a7---kajedefojafusatinunaja.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/gijumovawawuzuku.pdfIn PDF document text
    • https://riwg.in/userfiles/file/49979864059.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/81385273759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=red+dead+redemption+2+hungarian+half+bred+locationPDF 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_off0000ae9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9C 14740 bytes
SHA-256: 4cf6d108b17234098448a9924d5d39d165257ee2614e4780ce25340b9e5050a7
font_01_sfnt_off0000d38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38E 11304 bytes
SHA-256: 1d1594b853cd35f6de0f4b0869f10f3d2ffbdb1f8d84a99fa8a6390e0f3c35ae
font_02_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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