Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af6de1d76f1c355…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 15:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 367a7a28605718c341d7604631eed2c8 SHA-1: 3e6c82e79dc924040a2e74232056b1605d6c865b SHA-256: 2af6de1d76f1c355cc8fd3a5e43f8fdfc3dbab2c6672fff533e824f650f26e87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised websites or are part of a link farm. The presence of JavaScript suggests an attempt to execute malicious code, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://wastran.ru/uplcv?utm_term=servqual+model+questionnaire+pdf PDF link annotation
    • http://acecaalcoy.com/userfiles/file/36081518193.pdfIn PDF document text
    • http://wenxuezj.com/images/File/benejuziwukuzisawe.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/89090327507.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/jevodidexerenina.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e779de895a---basewisenexowubufowe.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/24929364897.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/94023934194.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/gotedefawomopureperewuja.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/5d2rf152nteatsprtegm8gumvi/vixuzolirid.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/4581267240.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogate.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/56167cbde18d1c98c74b1704ea9b9f1c/78638104284.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/74gun13msorsl2nve9pjug6du7/vajavobebawiwixiwoxe.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/21333061557.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097af7ddb958---84087949851.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88727dc43d---gokoxonofep.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/81439807078.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/85751676006.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/kivofozivizilixan.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e711635058---13497014536.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a47de6aba06---25155166872.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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 11044 bytes
SHA-256: 50952717ad7dd2ec90e859e5c036ccee2703c9cd3fb806b38e0494e6c6fe6668
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 19316 bytes
SHA-256: 08e00e6693c828e45f674ebf6d2cca6ebf261c24870a295b4e108717cea4313b

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