Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4a8db10a72ca4c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 13:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00d97cb1dbbc1529cfb8b2f4bf8ac1f0 SHA-1: 02d39374c6711626656acd241371f5fe7ae134c7 SHA-256: bb4a8db10a72ca4c74081635b0543f2620e2666f96eca460f0969f1f583da8f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, some of which host PDF files. The presence of these links suggests an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.18fire.com/wp-content/plugins/super-forms/uploads/php/files/03a01247d49486131124d45a2b581013/84613897410.pdf
    • https://peintures-descours.fr/fichier/files/80274888592.pdf
    • http://sva-jeanroze.com/xmedia/file/33968942618.pdf
    • https://tavcam.com/upload/ckfinder/files/16467741980.pdf
    • https://tort-art.ru/userfiles/file/vozazixisepatono.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/185db14e831c5bb7e404594fafef5610/zomusivawipalule.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b626a13f9ef242f128093f131cb604bb/1879947176.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096027c716aa---50831399530.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/senojisodizaposezomujigo.pdf
    • http://torgoborud.org/images/file/55323577565.pdf
    • http://ih-consultant.com/ckfinder/userfiles/files/ginijugi.pdf
    • http://orikon.net/Images_upload/files/16005313267.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pitobejibotejiw.pdf
    • https://fleseriuassociates.ro/files/file/44190666818.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086397963cb5---lorod.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bc8aca183bf---paxunadofaxuwafula.pdf
    • http://apsara.ru/userfiles/file/xemufulade.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725554e28c6---82097437544.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/2f95e535731b1f6b67c15f2093e1b669/suguripaduvuweleponoza.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed740ec9828---wulajexanematodolerafop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=descargar+diccionario+franc%C3%A9s+espa%C3%B1ol+gratis+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caac.bin
4fc6f58efed77079e30a7f6952aa6fc82e0b44dcd0296500e06603cb13886d26
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 19120 bytes
font_01_sfnt_off0000fb65.bin
00c81232d14e0671627e26ab68d6ae2f5eca8679d2368a227d4bf4527db52c19
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 11156 bytes
font_02_sfnt_off000114da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 16792 bytes