Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbeb94dfedf5cc27…

MALICIOUS

PDF

64.7 KB Created: 2021-09-06 14:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2eca6c011765a3fa5fdc7bc6404d8044 SHA-1: ce17aac7d2359d1e85dd8a6b39d97a7312f541a7 SHA-256: cbeb94dfedf5cc273024fe5cf5df4b65932802f2e218240b0533616592a18583
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 within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, indicating a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9524

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160932a645404d---sakosufitupijeveteg.pdf In PDF document text
    • https://thefertilizerequipment.com/d/files/79167305006.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6mathoc1fd2inf1lu418140b6d/mewutig.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/68558740693.pdfIn PDF document text
    • http://svx.su/ffile/file/43465606356.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/credpib5kelscjgtpdnkr56h95/zutizofog.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/14966695096.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50074007720.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16119f693664da---wuwapewijijoj.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4a292137e5db9b6676a280d91c90dd7b/69406995462.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9236b5f6a1---rapiworaxet.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80a06bc3a---77748696391.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8448227e4848faf4c87eb0ed9f87b8c8/lapoxujelumuwovemaluset.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/86342121991.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/20043046598.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/q7ercfnne512b9p52l1vd9haug/4962133782.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/mevajijowepamorodefux.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d42c7307765a441091a378fb0eb9f2a4/fakusaku.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc51ebee1---95347105894.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/73715556621.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/wazewoguxurawakifepusamef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=convert+images+to+pdf+windows+7PDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/gobovaviwarebubimubex.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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