Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3fdc6f636b76d9…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 04:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9090b1da4794b4668643645a08bf4484 SHA-1: d767d165fe26497ded868ff9b54916319d456686 SHA-256: ff3fdc6f636b76d908e9ba95b4eb8f478dbc87196112970a59e9270d1bc003f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.moyekolodin.com/files/77458459964.pdf In PDF document text
    • http://888spirits.com/userfiles/file/13349292279.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/vajikivixipot.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/ginoxutotewemovowin.pdfIn PDF document text
    • http://blueyee.com/upload/file/040028366487.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/mebazaxidebib.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/27528171888.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnbedejb6bckuvbelpqbbpjqnh/71262853918.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/62427609532.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079404b4d451---31802287765.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/mavakega.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/28477502678.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b2100ec3---sisite.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/difiduwufezojo.pdfIn PDF document text
    • http://cssh.es/img/file/46793204468.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20724120a---10131028759.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/32456285390.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/998u06fuddahfvhkg0hd7tddf6/xubuloronukodogepegima.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f836f9391dce24158967ca4f6a776f85/gusutugafofomowalaxe.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/tdj5o1cjr0omn7ft76igo66v98/xesenu.pdfIn PDF document text
    • http://iworking.vn/uploads/files/lulenijifiw.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f938c0c52f9b5f57edfcdf779708c546/40755417730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=de+las+estrellas+a+sof%C3%ADa+quetzal+noah+pdf+gratisPDF 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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 11144 bytes
SHA-256: a5d7c9467fdee81ee0271d59f58ad79e9fe7fef71f5402fddbcbe27c9ce459c0
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 20508 bytes
SHA-256: 63667298c60e543fd16a4f04dc9c21da47ab0382330452ac6eb01f59606b84f4

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