Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf086061afdca92…

MALICIOUS

PDF

77.9 KB Created: 2021-08-26 10:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58d7f12177d2b97ae9603bfab824da5a SHA-1: e1351b65abb479e83aee32df6b738e299e9ee4eb SHA-256: caf086061afdca926902a5465fe968370bd82bd36fa378b9244a9c717cdeef5c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5355

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://windmill-bv.com/userfiles/files/60284976124.pdf In PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/6nq8tnneh2pn3nq2sucl6ufoih/74904360711.pdfIn PDF document text
    • http://domosplast.hu/files/file/56292844917.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/miminevokeged.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/tipuzixiruvirujanukavug.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/saxip.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bmkrp1v7tvi61pp9h62tmpjj0a/36803862727.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/12777590070.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/g9g7jb4c83gr8njq0srtc0kg6j/8601417893.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b647453af1f---xevalokimosefefofaguta.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/zolulazofepusevilonib.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/mimolulutubuseditefosat.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/vekifovutokowo.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/67181633704.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/92827560324.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/16696892636.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/resanosufugupuwiwetudifim.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/pinejolajazugipazajuzu.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/21651136031.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609833c0394d4---7545526937.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/70776330092.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/33905370016.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e661ecfcc5---zutitorirekusobimet.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9f19d0eb---54864945705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=baked+brie+with+dried+cranberriesPDF 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_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16728 bytes
SHA-256: e9bedb920e1b7d2bb5aab23b6f17a31f24284385b86f0ce1f35eac0a908941f3
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 10672 bytes
SHA-256: 298a34ba3e322d0bcdcd826225763501397fc67267723e427f474b6f5bf443da