Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a043b3a970bbbb…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 14:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50ad8a93b0c4ed845211bf7a8ea5b737 SHA-1: 743f791caa0395edc48e1faf3499db78c736038a SHA-256: b4a043b3a970bbbbb57935d24d7654a1c26ca4c5cf46158d47e89a06906506b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, preventing a more specific analysis of its direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://thefencedocumentary.com/adminfiles/file/nonagivotoxixukal.pdf In PDF document text
    • http://udokutscher.de/gfx/userfiles/files/gewezilikurukol.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/tokujixopuzobed.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/24728119257.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/270ad07b68be3494853269c288c6b0df/tiratezito.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/bolakediwumadofi.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/29213244144.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/35c7e865a3dcb4205c36d36fe8fa20f4/5158234406.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca85273c62---92673438114.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/94ef958ed65042ba2cccc8c2c4ce0928/99610369919.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/fipinewuxe.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/tolabo.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/88998473012.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/79817966746.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/45700456288.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071970221acc---26150441244.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/fofitazitonudu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e58c61e3fac50d58c5561d766db5aa13/20586033460.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f96622c31797ce63838bfe28b4de80a2/67122794100.pdfIn PDF document text
    • http://haphadoor.com/upload/files/72179247106.pdfIn PDF document text
    • https://andrejc.si/files/file/serikitasuvirisanobu.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/47451074654.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/98470770913.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5f2c538f6---dababudosuzukawogegatav.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/25923578296.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/rafixajuveseli.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/53350151456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+optimize+pdf+file+in+adobe+acrobatPDF 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_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 17628 bytes
SHA-256: 883772d9f3db1895feb3a55a65d42cc024c3e41ef1c5b7a5183d5e73afe5598d
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 10888 bytes
SHA-256: 080163e97711a2808cd6325322bf7265811018ae670e2fa3e52bdec113747880
font_02_sfnt_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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