Malicious PDF — malware analysis report

Static analysis result for SHA-256 960c8a2f00896118…

MALICIOUS

PDF

85.9 KB Created: 2021-08-17 05:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 827a1afca0831d9ea659532dccd36bba SHA-1: 12db6d28dc575db2d6599ce40e021e1a2ba469cd SHA-256: 960c8a2f0089611843258009bc6beb29c4cba3d2acfef5c2fb281ab212a43745
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the high number of distinct hosts indicate a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9354

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://ahreco.com/uploads/news_file/mawinipowetitebujokejukuf.pdf In PDF document text
    • http://fine-trading-knotwork.de/uploads/media/mumesopetebovikad.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202108160805316286.pdfIn PDF document text
    • https://ms02bet.net/contents//files/nukixaxa.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c04c708e---39026620478.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/sabalo.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1c9e51bbdc82e6cf32e924f68b87f187/92467466641.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/meruvawerasalikonuwexir.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f63e2181---22496639971.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/duwoposoda.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a7d4c5c2a---85268482136.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81c01df34---79244153368.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdef9f7408b---risavitutiviwexejut.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/kogn317mt4ceb9rvadjcsr186m/wokaporega.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/kedunimakek.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/41635637969.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/40326900510.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/nifozumojutufojejuwit.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e690378425d---toluvawerevanikaw.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f043aa42b75---xilivebixatuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=why+will+netflix+not+work+on+my+roku+tvPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 18172 bytes
SHA-256: 0c053e6118cf13f67ca33694ff14f02394aaf69bc5c652030c55893216b5b6b9
font_01_sfnt_off00012ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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