Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8aa735d05c3678…

MALICIOUS

PDF

70.9 KB Created: 2021-10-11 23:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 965fe68b64c55c4bba925962f77f4b59 SHA-1: 89703fc86dfe6f87e7c1ad5a6191e5313816dcf0 SHA-256: fb8aa735d05c3678fbef83d298c6e5d4d63c262944e5b3b1ef0fea789ede5400
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, often with UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9156

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://inwebjor.ru/uplcv?utm_term=windows+outlook+email PDF link annotation
    • http://familiehollander.nl/images/uploadedimages/file/tevomufebugibar.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/lovubotobisak.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1ab98038---sivepikukutogarenotax.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/82276650309.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/85805517202.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/41f5aae5b2ab4ee7e17b2c86755a2187/84388195861.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/jusulokarodaxezujona.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/vatikebijinekuwixed.pdfIn PDF document text
    • http://beta-rc.com/upload/files/velelebogavuxuzo.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zuzazirekejebiges.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/wibazulekolovabi.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/5840256917.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/88r5nunej33plkig775bf5jhgt/65841295169.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/fapijifalimis.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/99297438075.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/dojuse.pdfIn PDF document text
    • https://ms2oke.com/contents/files/voxujiwejodatovubafasok.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/filalififoniga.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/72893949966.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/nakodakeni.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/podixujojim.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/tekobonipipavodatozojaf.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/4063845473.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4f915060---93239355062.pdfIn PDF document text
    • http://doxetrilinh.com/media/ftp/file/74164429877.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_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 18800 bytes
SHA-256: 65da356e3a72e84a9be168f66f23e53e637d7bd93596eea0d2c229a738c538d3

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