Malicious PDF — malware analysis report

Static analysis result for SHA-256 8389fa629a18736e…

MALICIOUS

PDF

82.0 KB Created: 2021-06-28 07:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca140eb41aafb71d87f9d0507510ed6a SHA-1: 919b2d9560761295a55a980c68531be613b1785b SHA-256: 8389fa629a18736eb6c58d7636fc0df3d8c24d346b52b48c4a400385e9bc2cd9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm heuristics points towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3ad017025cd5f07c7c91930abe09250a/kanawogabojadafo.pdf In PDF document text
    • http://extracam.es/app/webroot/arxius/file/ganorakolerasi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4ccih0dv99uh6ktphhqe6m3hdl/xubilagozaxizixatulib.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d6a62ef2d---40540846063.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/81081885708.pdfIn PDF document text
    • https://miet.hu/kepek/lejuxogavamojuzufusemi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e5ca39815---damirodin.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/lujalazovoropuzegara.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd487913f6---28999735047.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/75f90a25a3f533130888ac78bf252c1f/rofowibesodarowokuj.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/jatilepu.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/vanugazewosanutat.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7m1iskm3qnonn0c8btpa9601br/98540427078.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/repegejamam.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/78575699885.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2cd436de5b54a48b3a194bc2f347716e/60234370521.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab8e864a8---dukuwoku.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/er8beme0t34vv13ea24asf00g4/97517987668.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/21457888878.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8a0fc40ffe316c20996d56e6802e6b03/sipib.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/bl021qkkqtep93rbflbpehcgl6/sekanasukumatuzuxojexezad.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976dfd8ad08---26498975635.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/46254969960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+recover+unsaved+files+from+wordPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 17012 bytes
SHA-256: 8050e6fa219202debcac46cc22272120a3cb5227b51f8212f1c4415dda9b2713
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 10880 bytes
SHA-256: 39f0e0022577efa57fa37814b9de36540dce3cc8a70157440bd363f13003c96a

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