Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d15f0bd50db13b1…

MALICIOUS

PDF

86.2 KB Created: 2021-08-27 14:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40cd6bac05b53ccc99bf7e9f9ed3571c SHA-1: f2fa8e4ffea44440b4184333b8b5dd4ba1342408 SHA-256: 6d15f0bd50db13b15679b1284f8d7a55361d080cad70ac9917cfcdbaa3fc01da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which are hosted on compromised WordPress sites or disposable domains. This suggests the document is part of a phishing or spam campaign, likely intended to redirect users to malicious content or further stages of infection. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://lucchetta.net/userfiles/files/kaziti.pdf In PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/kiweti.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad759208e---lupusilorajulavozumuvunu.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2d192d08fd096f8f10807e2079054c9d/dijisojidusuva.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/sakelotakurak.pdfIn PDF document text
    • https://atavio.ru/files/file/lezutujoguvasusumubabez.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/63253422446.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/38e0c9c2cba97ff5faf3f4339699ea2b/netupuxonejezofu.pdfIn PDF document text
    • https://mollis.rs//files/birino.pdfIn PDF document text
    • https://udruga-invalida.hr/files/newuvikuzup.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/laxiwasokexutegi.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xabefilesulo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b48694e936c9ca69a12d99c9883bc82c/rikukin.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/cvrfg16lnn2tt9a2qej0sio704/88481798379.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089ffc05305f---gorasepomunuji.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d65c2e9a4070fe2efc1154289da6ddc1/64864118367.pdfIn PDF document text
    • http://st03.it/userfiles/files/kifufiroki.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e20886e57---kowulowomes.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210603153124410771rkssch.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9d356c125db78869335bf9fcc52913bd/1982449755.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780cf9a7bb5---giwemozopufobid.pdfIn PDF document text
    • http://compsult.net/userfiles/file/59471603573.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/75ce2ffabb9fc9492bab519a0738a726/fokubosepekugibititalaje.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a96627a7---pewoderutabojosevoresojox.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160732d5d5b606---34562707656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=average+size+bedroom+dimensionsPDF 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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 17584 bytes
SHA-256: 674584d10077a93e0cde05943fc291155e5d6e98d614164856a6dc0fdd00ffa6
font_01_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 10696 bytes
SHA-256: 25d25e2e8b5db1bed1962c79e8f3464fe560f36fee7f539014fe1af03feb1b32

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