Malicious PDF — malware analysis report

Static analysis result for SHA-256 820092dfc40ecdb7…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 12:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4b271ee0399ba41e32aaeade0739dfd SHA-1: e47ae7b5c8a834a5cb870416c55c6e2d507f5f09 SHA-256: 820092dfc40ecdb78b96547e0366b8e0204e5992906449961af079ef97293d01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://inwebjor.ru/uplcv?utm_term=good+first+names+for+a+boy
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fd3319cf---63387419428.pdf
    • http://tele-video.ru/upload/files/18122153038.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sugubavesemuxatojajori.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01168c862---32629208535.pdf
    • https://clinicscrm.com/img/files/sivinubuwanalimoselamu.pdf
    • http://umrllc.com/userfiles/files/fasixodatadi.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16093476d93ed2---83179301439.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/inl1d5rq3ge7dt3aenbo9aouk6/43706753487.pdf
    • http://mulroyenvironmental.ie/userfiles/file/mafanelu.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b8b171b4---32215201612.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d6b152f59469f5759c15451155372a51/79459745607.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67c09cd2b---474997895.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f446190d---22782314035.pdf
    • http://yasairamenbar.com/uploads/files/kepimuvuwox.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a13568d00a4---91917519597.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/onu1cn8n3tgv3f2sr4bm5rktg8/gumewologopawu.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kedaga.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a632c88a35a---29701421347.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/57dedl7ogsvjf9pu91n3en2kc2/demazemanujowo.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949cc40e296---mifuwulenewaxonovejosil.pdf
    • https://moto-trend.cz/public/files/fck/file/nedoj.pdf
    • https://alternativecarrepair.com/userfiles/file/56198359434.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b681ba6d9fdf205bfac42283cefed8ca/56112687955.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3195bcebd---10197769189.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/qioemf8mkhe8ffo7pqltl5oep2/xiroledugudorixos.pdf
    • https://dadesigning.com/daduserfiles/files/51928367175.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/61646777972.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16792 bytes
font_01_sfnt_off00010d10.bin
f12ac208c3814f8c3894f72176534ffefa9ac0abc8d113cea99538eeba3d5764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 17728 bytes
font_02_sfnt_off00013b1d.bin
594009a29725a9095ebb8dc006bf0d6bdc87b969dcf71f4ade50e0ad799c13b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 10764 bytes

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