Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b00b8c9a44111c…

MALICIOUS

PDF

87.0 KB Created: 2021-09-03 20:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fab7500ba8bd760d35acdcc9b8acf4ca SHA-1: c470c0f49f5861698780682ccf1202bddc9f6eea SHA-256: d1b00b8c9a44111c60092861eed03c63d116ea74daad10bcbf68f8257321f8c0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. 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 0.9976

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://pixomot.ru/uplcv?utm_term=deepcool+castle+240+manual PDF link annotation
    • https://sunrise-photon.com/upfiles/editor/files/xobibimalemewopu.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202108150156152487.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/aa09c776ec14d48fe12f74a3471d352e/20368228970.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/298d4ad3807330436d286e0ea94b7484/juxogeda.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/64052749452.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/117a9a47d4d7a89b466a6017a14f2308/savewegokidomimor.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a92c3dd95---27506558862.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/berovoredevomozud.pdfIn PDF document text
    • https://termoformat.md/img/files/wijumolibokumegasoz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d29f2cbd7---fetevopigorinifageneva.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609940e074b99---70730129174.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/nopufesajurokegi.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/fijovadatudeta.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad5ad7eb9---zigodo.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/89096643466.pdfIn PDF document text
    • http://client.diffuse.info/files/93858087765.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/65jl97ab9g6djnu05v9micrrhn/83031313638.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o66gngm1ov77vnf5k8v3cj2d4a/52408870405.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/97337721473.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078d23e272b5---25419856605.pdfIn PDF document text
    • http://myqself.com/upload/files/67029227988.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dc5b59773---68478176991.pdfIn PDF document text
    • http://bamor.org/userfiles/file/27812681773.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 10764 bytes
SHA-256: 9b46c1ed3f4d6673bdbd676499723388f4cd2881dad1f6b18a0b0aba9036ea45
font_02_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 18092 bytes
SHA-256: 5a36e8669dd9bc6c2c6d9391d9a4edea20675050ae51f6b1081ae8943cb9fdc6