Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43252be4931ba90…

MALICIOUS

PDF

59.5 KB Created: 2021-10-03 11:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 403d5c00dc514983c31fceeeb6f019bf SHA-1: c36b5db329441e088138e988e7589a46a8d610f8 SHA-256: b43252be4931ba90729d5bee135d701306752646b7244f7c709dab7c599e7a0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging indicates malicious intent. The document likely serves as a lure to direct users to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7114

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://smidgel.ru/uplcv?utm_term=licensed+journeyman+electrician PDF link annotation
    • http://fiumaradelsossio.it/userfiles/files/87158609828.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/96065970731.pdfIn PDF document text
    • http://nktrading.qa/file/files/13161704648.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/66603969942.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/pizeselozobumisese.pdfIn PDF document text
    • http://xsteelstock.com/d/files/jelikavesado.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/59644878225.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/27350018093.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/ritivokigavibedexo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613431f7cebc7---neroletisu.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/vekoxazegowerazoma.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/12664762185.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/xubisemokanukifenakugaze.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/79970330644.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/13320997904.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tubesafobuwafeperer.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6fn985jrbts3jhcag8l6im9f32/72367498089.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146465bac865---vapuxuveluzajol.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ibs328uu4ce3jt4jjngf6m7ukt/rafomezugusefusabur.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3b4511ea---ninarimiguwupal.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c249f2e21d---3916450582.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/fepazakidowizeginibivuki.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de45f669bb---63327357033.pdfIn PDF document text
    • 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_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 15080 bytes
SHA-256: e6d6ae84aa5a85416ea2ba9e1eff838b28cf5015246de00f5cd7f2cc1cdf982b

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