Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee522948f1be9870…

MALICIOUS

PDF

65.1 KB Created: 2021-07-16 20:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca5c0fd70191e584b1d3236a0f0d8bd3 SHA-1: 67da5c4d07654a5aad158f7b3226204485fd5a23 SHA-256: ee522948f1be98703efeaf33c2ef18072b916c3c15b5ab27f9b4ae39fd4ca222
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious payloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting a coordinated effort to distribute malware through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8358

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://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/56752ae89a36d6f1c69e7811e4345f05/94500620203.pdf In PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210522071430.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754e10d30fa---fosepisarafulusalote.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/91776444985.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e69b2dc833bd1bacb6e1ec99b450c3ab/75524391663.pdfIn PDF document text
    • https://begili.com/uploads/image/files/mikukujumobo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f56f31ee5e---rujujewewagux.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/veladaz.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/disuzutofepajonototelod.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aab64414602---76883058370.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/delalixeladisasomato.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/68336081423.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/darepanumotuzilexixotudu.pdfIn PDF document text
    • https://luminex.pl/upload/file/gagoverilogozikupis.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d51ad16df9a---minifusowedef.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/2364c3861b44de24f234645f2a14cfeb/33342144935.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a304f7cce64---wufulurulutixeru.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/74240406891.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/1813657828.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/iku6he48u7rqadvthubdh3lhp2/11897565738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=electric+field+intensity+equatorial+linePDF 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_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 17080 bytes
SHA-256: 411ffa99db9f5dab013ca573d670b9b0871946e49a6718179aca2695b8dc9cc5
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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