Malicious PDF — malware analysis report

Static analysis result for SHA-256 93853e4341b14fc7…

MALICIOUS

PDF

79.0 KB Created: 2021-07-30 16:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c7fcbc7d2e09082d963e87ab78ada06 SHA-1: 47440e394e1f36506edcb102adf013ccde2fa9b0 SHA-256: 93853e4341b14fc755893286243cc0e0eb9974d37a991b3553671309299e90cf
154 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b788e0855---vigobiru.pdf, are key indicators of this activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9281

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lube-stc.com/ckfinder/userfiles/files/10676539889.pdf In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dbb374e41ae6af39aa7d6248bc92347b/76048161602.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/27084070124.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/87541058608.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/46705211200.pdfIn PDF document text
    • http://samtle.net/ckupload/files/87285990123.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160904ab5d994f---gesejotuvutipe.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/gavdaifq8qg3vliea80o6449q3/voluxasagavu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tezojotepiluvus.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3baab73871---zegirajepiwosa.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/toper.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098db6e4ccce---38119262612.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/33721733.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b788e0855---vigobiru.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8c0599e0---movobamitolipawamugasuz.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/segubujapuwijugijagojolad.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/35289969005.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/46167204786.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/fupukivuwadawanekew.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb0cee03f3---27456651131.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c29130ccc6---falexusilarapuvij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+author%27s+message+in+all+summer+in+a+dayPDF 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_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 16680 bytes
SHA-256: f6b48892e2086801bef019e14c146155b9c17c38d3862ca182381945a14c150d
font_01_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 10936 bytes
SHA-256: ee3ea106ba6c95dc260aac2fe153072fd6435156830d057c5e5bab3def343af9

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