Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8370f68ecec8a86…

MALICIOUS

PDF

56.8 KB Created: 2021-09-21 18:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c16fbd9272ecb79cb0646630446c3d43 SHA-1: e104b275b158b7498f7ac1af6455b0aff12b6484 SHA-256: b8370f68ecec8a86fb152dd0a1e91303bc32fefd46c43a82ecdd86a5464b4924
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8380

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://infrive.ru/uplcv?utm_term=tony+hawk+pro+skater+2+android
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/30192543381.pdf
    • http://air-con.ru/upload/files/magefavemupavuxipesusapi.pdf
    • https://mimpidia.com/contents/files/12440088503.pdf
    • http://crestviewshopping.abwingsmd.com/uploads/files/fimoxawifejumu.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2ba6443b6a3d4f143b0b97421be4ce81/29537295556.pdf
    • http://energosol.pl/images_cms/file/17016731251.pdf
    • http://hhsmelt.com/upload/files/junuxi.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/bimojuzuvifemedur.pdf
    • http://olivetheater.com/userData/board/file/buwapowokavo.pdf
    • http://pusheng168.com/uploadfiles/20210906200616.pdf
    • https://kompaspt2.com/contents/files/78401848761.pdf
    • http://alacartedesign.de/userfiles/file/siniduduveravivirofexafa.pdf
    • https://fibra-optica.ro/ckfinder/userfiles/files/3022811139.pdf
    • http://simkoongschool.com/uploads/editer/files/95832957874.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/63979493863.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/lontd6q9dkrht7i1od834rj2sl/zofidatuzotizesijejufami.pdf
    • https://sieuthigo.vn/upload/ck/files/jebabuze.pdf
    • http://tasteofruraleurope.eu/upload/File/mokavovo.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210921095527016986esd4va.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4d98f9dc8f86f74c6d3d91b18b74005d/46501560049.pdf
    • http://na3.it/misc/file/10989273150.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1ee5ba2e4a58bd62fc2d8fd8146a4fcc/20015839312.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_off0000ca51.bin
ce128517a8f65166f754cb0ed3f4cc428ac76e246382eecba3a2740195d03fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA51 10820 bytes

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