Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8d1cb098d27e3d…

MALICIOUS

PDF

63.8 KB Created: 2021-09-22 15:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22a4a7d49894b2b7b868d4661d00d7f2 SHA-1: b601fccfc991697dc725dd67fe28f881626f4cdc SHA-256: dc8d1cb098d27e3dbf00690e8aef695c1565efb8430de4690357bd73d8ca5275
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions like downloading additional payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7920

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 https://philabc.ru/uplcv?utm_term=after+dinner+dua
    • http://connect-event.fr/ckfinder/userfiles/files/28975365579.pdf
    • http://4els.ru/uploads/images/files/55186497996.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148a1f484748---51497249420.pdf
    • http://argol-editions.fr/userfiles/file/94626829826.pdf
    • http://guowangcable.com/d/files/1492293817.pdf
    • https://latework.cz/soubory/jikofezodowetuxot.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/terituxenewazererugewi.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/xifopesasem.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9850fc28---vizivuxukusi.pdf
    • http://polipack.ru/content/file/vosuxigibar.pdf
    • https://bomando.bomsolar.com/uploadfiles/files/javokomuvab.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144840e57817---ripemizuzaxub.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f109b707d7fab67bdba4fc96b0039342/vanivobowotapukewopof.pdf
    • https://altonika.pro/files/fck/file/49454168709.pdf
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/zawesamazerulu.pdf
    • http://softtox.pl/new/userfiles/file/34188847838.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/fb07e9264d4964de7d215f0e689e2797/86364055854.pdf
    • http://docando.es/js/ckfinder/userfiles/files/xudusuzimuzifaweludon.pdf
    • http://rebizplus.com/userfiles/file/kusefozoruduwupememap.pdf
    • https://alwaysthesame.pt/site/upload/file/pubebetifunifisebo.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3c6a56ed63a2baa40dfa721847eb66f4/ziseja.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/kobik.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_off0000befe.bin
b51ac29364570a57feac5b77be21b6a60a87cab139f163e7b280ba07d42c9bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFE 22248 bytes

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