Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfc6ea725cb342f…

MALICIOUS

PDF

92.9 KB Created: 2021-09-15 20:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f33f8a479863839716f09f463dc2d18 SHA-1: 469cd139a8c3c44e62f59d5d7a8bbb043b1f5ce0 SHA-256: ccfc6ea725cb342ff18b4c4a05b26c454c2787ad3f5704a9e6380c83771406de
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host further malicious content. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

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 http://criminisiepartners.it/userfiles/files/60899554611.pdf In PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/bepemotezuda.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/52f582b6d9616cf54912efe274aa7e6c/witivuzoku.pdfIn PDF document text
    • http://netart.hu/userfiles/file/48829731039.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/57200632960.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161327b868ea05---kigerum.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef5c64e75---kifibesakigitide.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/mijunibafesasuminujij.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/22820371165.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/73793550516.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/72567298618.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/22341121455.pdfIn PDF document text
    • https://halead.com/uploadfile/1631346270.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0a8fb6c1374170284efb81a392261566/44601188627.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/8645647136.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/81965101239.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/pilox.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/8552274369.pdfIn PDF document text
    • https://fuoriscena.eu/file/bifexuzig.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b5b233c7b---54358343980.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/mepogepuzasifiwov.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/59318277821.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vubolejefupodunop.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/nijazitogelujabigakewure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=throne+of+glass+crown+of+midnight+pdfPDF 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_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 18884 bytes
SHA-256: 8022be527a1ecbd466abd2043d7256b3a74a3cd2b0755d3e7170da48216c54fb
font_01_sfnt_off000141a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A2 11116 bytes
SHA-256: 48ad24af4fddc78055d14383ce93dbf095d6d70d9e9df9119d11382eed2e7598
font_02_sfnt_off00015b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1