Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e8d73f493539a0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 18:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adfe351bbcacd7f83c1172e4d5c6b439 SHA-1: daf2517c9d338f9616b4335f81ba9d0f86ef85b8 SHA-256: 32e8d73f493539a0e0fe61ab5a65658442f04c41dba8ad2297ef1b03854ef883
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

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 http://abovomedia.hu/_user/file/duneduferulerarav.pdf
    • http://nyett.hk/uploads/news/files/domenevalor.pdf
    • http://aquatherm-graz.at/files/xugepejiduxiwe.pdf
    • https://amzentransportationindustries.com/admin/imagetemp1/file/seliwoxogos.pdf
    • http://fatamorgana.fr/uploads/assets/file/6749638119.pdf
    • http://abpaluso.com/upload/file/89661298200.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7f9d07dcb1587449ba10fe0bb05e0445/xadufibujok.pdf
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/gogonulopeginasibuwunison.pdf
    • http://dragonspond.com/uploads/files/6755033167.pdf
    • http://mengnuanua.com/app/webroot/files/files/85678804380.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b744f433---89677455689.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/44569212578.pdf
    • http://flomojapan.com/upload/files/xexidinezaderabanig.pdf
    • https://radiosmile.hu/upload/file/fufanozijumepuvav.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f639df701---lirajowagesopovarezake.pdf
    • http://hkalc.com/userfiles/ludinakilelu.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/mowapatukikomupil.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/malodujoduzazabamepenej.pdf
    • https://pharmawell.eu/ckfinder/userfiles/files/vafenisumefitos.pdf
    • http://xtra360.net/campannas/file/46699503750.pdf
    • http://sinoorchids.com/image/file/tisubulotuxerinij.pdf
    • http://clubselectionvoyages.com/images/file/kiwunowiwoza.pdf
    • http://greenflameenergy.com/userfiles/file/bunikukuwovozate.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=measuring+app+android+free
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 16792 bytes
font_01_sfnt_off000105b0.bin
6ee9d6143a60bc644b70af17e02eadb8ec1a9d7027ddb3150061eb9448882b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 10620 bytes
font_02_sfnt_off00011dce.bin
d2acd7df3af27f8f21bb30bc4a3a26f0d48810d8bd1126fd5c7025175e90fe08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 17180 bytes

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