Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9bbb96b8c4e8e2…

MALICIOUS

PDF

61.5 KB Created: 2021-09-21 22:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3714afe8d3be45b09dfc23818d3e76a0 SHA-1: 82e95e3f5041977ef0f1785c6933a5cabf04dc3d SHA-256: 9c9bbb96b8c4e8e251c9666e7f6e5a7c139d7eb1aa0bcd70a7cf96efe3d63a34
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage 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 presence of external URIs and link farms points to a tactic of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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 https://coretry.ru/uplcv?utm_term=moto+x3m+bike+race+mod+apk
    • https://pepinieramontana.ro/ckfinder/userfiles/files/sodozomi.pdf
    • http://etalentlink.com/uploadfile/file///2021090601484578.pdf
    • https://axlthailand.com/imagexx/files/60004873562.pdf
    • http://sigmabhp.pl/userfiles/file/dafugapanimij.pdf
    • http://massarentearchitettura.com/userfiles/files/55500947859.pdf
    • https://cornerstonelaw.eu/userfiles/file/kosenuw.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1e50264cd0ddc70a39a292d0938ea504/89538824124.pdf
    • http://slovoveri.org/userfiles/25828918830.pdf
    • http://evevoyance.fr/adh/.-/file/72735513300.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/guxibibokozorakiw.pdf
    • http://usatovl.ru/upload/fckeditorfile/29958947477.pdf
    • https://broadcasthub.com/ci/userfiles/files/61665020416.pdf
    • http://libron.pl/fckupload/assets/file/68065018180.pdf
    • http://safetruck.gr/images/file/wimenevos.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147c13606eb8---zobad.pdf
    • http://studiogiamberardino.it/userfiles/files/68268143162.pdf
    • http://cascinamana.it/userfiles/file/wuxuvuwe.pdf
    • http://orderkiwicafe.com/uploads/files/puruzurazobus.pdf
    • https://gameclub.by/uploads/files/xevawulobazez.pdf
    • https://x-software.cz/data/file/4488509950.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5a965a07---xubufuwiwijojon.pdf
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/tutugibufovolen.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/27694114893.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f04e8c879---potutamelugosiwu.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 16792 bytes

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