Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb77fe227ed9d3b…

MALICIOUS

PDF

191.5 KB Created: 2021-08-03 21:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e4a92efa1e9dbaa12105497befc5c51d SHA-1: 02bab806f59e08525454b009a5a6d63b32150f7f SHA-256: 6fb77fe227ed9d3b36108845a31b3e08a2e87b2e4203b10b39d9e55b8eb69708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://nomylo.ru/uplcv?utm_term=how+to+play+alpha+minecraft PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/835f4c906cb97add7466f8743fdadacf/56553416216.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e635f6ff5a---40246485685.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059ff8984ad---lejabijosumedepomakasagus.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0b430630ab43f4865405dc3d69ba7402/69893863418.pdfIn PDF document text
    • https://reniuved.it/file/wamirukulubegixavorana.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/190421353113.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/38721133932.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160acb71692fe6---69912291003.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/kusududidosuzed.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/tanajoj.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/40990800571.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4e5261b53---17437460278.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9cd1b9d64---dewonebozubasirid.pdfIn PDF document text
    • https://kartplast.com/resimler/files/fadalezawigegamadizod.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7ae2e160c5d8a58135d157936456c59a/gofexijinikuvagasobe.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/takinizesegu.pdfIn PDF document text
    • http://labonscafe.com/userfiles/70259941112.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c064bb2d8c1f7f84f1ec2dc6d4032485/patoxi.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/fumezupi.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/nezujuxusate.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fca78306df8---doruxexuleneredusokeb.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/51790685080.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/68560824479.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_off0002698d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2698D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002819a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2819A 9512 bytes
SHA-256: 97db07c38f9c6fd44afc6a0f64b1012090794cb8449aa31cc7a307edde00e69c
font_02_sfnt_off0002a16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A16C 10768 bytes
SHA-256: 64c47e89eabfd34105ac141ed1e6b799258d2f1e932b99d46e22bf91b2e06e9c
font_03_sfnt_off0002ba07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA07 20324 bytes
SHA-256: 29d0fa7b1fa1dd380f635afe22d861d9bddd395ac418b5f84eb2ac7756262395

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