Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff05eb551626a5e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 21:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2d921d416401187c3d7f0ba2853899f SHA-1: e5bbccca7d28408f265826fd7d5cc52bd79d5e8a SHA-256: fff05eb551626a5e5de72c4c14f0a7daf4aa092a75d84b7290006f207482dfb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to numerous external URLs, with several hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=math+worksheets+pdf+multiplication PDF link annotation
    • https://xn--atpta-nfb.lv/images/userfiles/files/latigisotomefiwu.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/38619154388.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-7/20210507061612779964.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/s5r3mombmuskoh08lu54i30qvr/53625769631.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/31641772227.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/31207048139.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/99414627063.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/76385655323.pdfIn PDF document text
    • https://kimcert.com/E/file/4881292140.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/mowewebevifiw.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/rilug.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/31288735829.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/bizubupomuv.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa45ddd2a---81806635098.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/dimegekudiloxoxuwamuje.pdfIn PDF document text
    • http://sartor.ru/upload/files/fajopi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jt82vt9e9ioqgsebbcd20845v5/wumagubazeruwipalodudavum.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/niwituzejadejafiven.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/31748137270.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/6cbfd534384c2f4dcace591358f05ee5/wefixujuriduzoxifarubiri.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/luxofisuza.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/43905977328.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/82845159748.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/2134918667.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_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 17420 bytes
SHA-256: 8bed450dca9e6d39c5700a8908e88f8c3c70d2678553609ab9259cf221f72a1e
font_01_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 11156 bytes
SHA-256: dcd5e38b54498fbe00d548fc5f866a538b7fe1080b91a97e56780cdb00795d7a
font_02_sfnt_off000136c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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