Malicious PDF — malware analysis report

Static analysis result for SHA-256 401731376c7c8c8c…

MALICIOUS

PDF

63.7 KB Created: 2021-09-22 15:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4faf68163fede2a02cc7f129f2b264ca SHA-1: f8404293e6dc6c1e7ea5618b8ba81d3897803d51 SHA-256: 401731376c7c8c8cee9d0bf4305344612c25172aec13e566f17e822d8b7197b2
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 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 delivery. The use of external URIs and compromised CMS uploads points towards a tactic of leveraging potentially untrusted or malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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://medvor.ru/uplcv?utm_term=la+princesa+que+creia+en+los+cuentos+de+hadas+pdf
    • https://lemarko.com/userfiles/file/79792721334.pdf
    • http://taxplus.in/images/contentimages/files/xonilezedofamemepo.pdf
    • http://art-ball.net/files/file/96870092123.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/baxapakuxakipumovuv.pdf
    • http://cserepakcio.hu/xdata/file/29320966263.pdf
    • http://juha.be/_files/file/bokukawebawagisufuxad.pdf
    • http://garantc.ru/userfiles/file/zarogolekaxiribakabiteje.pdf
    • http://ncfc.com.tr/ckfinder/userfiles/files/puvapokalokexefexetejujez.pdf
    • http://langeline.com/ckeditor/upload/files/mewakowugaxuvobumof.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f103caf4---tumajawopiza.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/385ffc64ec5746b2c8a54070ffd1fd69/99909687396.pdf
    • http://mikomisushiwc.com/uploads/files/69134018137.pdf
    • http://3mfa.com/images/editor/files/59633756149.pdf
    • https://mimpishio2bet.com/contents/files/kenegevazidezufefo.pdf
    • http://rainternacional.com/userfiles/file/lozesajulel.pdf
    • http://www.saletime.gr/admin/fckfiles/file/lopivudinebitesodok.pdf
    • https://edinburghpools.com/contents/files/sewoluxofijaravazafade.pdf
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/61964489021.pdf
    • http://sissonne.hu/editor_up/xipusos.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/r3d8hn9162hv4jevr8e2evp2p7/juziw.pdf
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/nulukoxujunowumewolufuw.pdf
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/57954585549.pdf
    • http://c-six.it/userfiles/files/vegezopitetegewefi.pdf
    • http://aitrans.org/UploadFile/file/F1202109070903125560.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/nozigimu.pdf
    • http://master-br.ru/img/file/57888828941.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_off0000d33b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 16792 bytes

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