Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb23be424a690a9…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 06:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b86c4cb47646d5aace24f90d21bec1d SHA-1: f70908b7d3631a925cc88b684e298c32bb675ae5 SHA-256: 0cb23be424a690a9221fed2935f4dc39ada2e8b1b3c50be05abae4a9e22b8f10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external files, many hosted on compromised WordPress sites, suggesting a link farm designed to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=chris+brown+no+guidance+mp3+download
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bf34da625614a16a629e85a3465c6d49/tazubejuleja.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1f55b976---48103545797.pdf
    • http://talani.nl/userfiles/image/file/16090943811.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/208f4d78e9b23866e63993089b2cce6e/wopamutududuruwime.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/50c910a366c2c1485f1ca44aeb5fd806/50134962192.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b0a25c836d3b8c3b79e2b1df22fe95b1/zuboromagu.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/218cfbcc3e4a92786c5c53bf4b626ed2/29112049987.pdf
    • http://katheran.com/clients/55933/File/70392246678.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac514bb2384---kakobapesevupikarisu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c078459745---57053985155.pdf
    • http://comp-art.ru/userfiles/file/futunezepid.pdf
    • http://stellar.ru/ckfinder/userfiles/files/sujodojopoxukaropegex.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/71584229404.pdf
    • http://lulanjina.net/upload/files/48866830499.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/p7lrkt2ofut6mro2qcko509soq/rikajejitani.pdf
    • https://bdata.vn/upload/files/tobederopitizaxesogo.pdf
    • http://plnjl.com/userfiles/files/jukububivudiwipekadux.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e57592549---biliteburafoz.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a5c7afd35---gerasixuzorutofomavid.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/cffea7ddf368f3b4565450852e757385/nizagobibitoj.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0d3c6cd15ab8094f4f6ba6c51340fbb2/kusepirotulekipenobam.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072426ce199d---pelap.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0kjhsvsvuc2b11t5u7nem28h10/12112054149.pdf
    • http://seksdagen.nl/userfiles/file/nebodanegekidix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c60c.bin
9ec1fd7371b8ccebe763d26d94203c311cb757bf97ebbf3445c9ecbacce2d4f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 11392 bytes
font_01_sfnt_off0000e059.bin
8c59e913ba2a173b77386517d98991bbeeb6598a816a9de44ae35fabce0faac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 18224 bytes
font_02_sfnt_off00010f27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 16792 bytes
font_03_sfnt_off00012738.bin
3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 18776 bytes

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