Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5f6baa4d4337e4…

MALICIOUS

PDF

77.5 KB Created: 2021-09-28 04:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0582b929c849ecbf0042ce983bfe717f SHA-1: 0dd9c68dd9eedee7b8b116076127e7eeb57a3940 SHA-256: dd5f6baa4d4337e4a5da7139e67e31f912a9a91e06d5a15702bc8a57796ce74c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The presence of these links suggests an attempt to lure users to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://synerhu.ru/uplcv?utm_term=how+to+put+clock+on+lockscreen+android PDF link annotation
    • https://takarasushimn.com/userfiles/files/gosinetidusa.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613de69c1c6e6---puvowek.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210919181849.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/detebulixusepaziteneje.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/bd286c7cf12af2c1bf80324c722373e2/29562497969.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/13859676183.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/filexeputujujotat.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8941105215.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/77737303903.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/97297933931.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161523e7489860---23441990707.pdfIn PDF document text
    • https://everestart.com/images/stories/file/34907544478.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/96530399263.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/94822232173.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/9743657488.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/dugesobenofizixoxurigaz.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091400045760.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/pajibefofulobufemugi.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090813184073499.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/munulorekiditinuxamegiv.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/vazokipuvet.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/29427866147.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/luvuwijerufujukono.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/bixugizena.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 16984 bytes
SHA-256: 83d70d1e3fbb890f7a1085389ffc1e4071e50b00642cab1277c0bcb28ec8bce0
font_01_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 10776 bytes
SHA-256: 2cb58071b248e067c764e835788298b41fae060aa583f3f8579bc4eb3dc4369c
font_02_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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