Malicious PDF — malware analysis report

Static analysis result for SHA-256 49da37759fac7d32…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 11:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af302f7612e6f2991ceb1ab40e404c02 SHA-1: 4dadd270db66974ae96276aaade27a18d8a0e8c7 SHA-256: 49da37759fac7d328bdf3ec9fccbb307b0cf9073acdf75381c8383b462ca8070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=panda+desiigner+song+mp3+download PDF link annotation
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/80461927789.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8fp29afn468355d8k3bbflt8n4/87880307638.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/tivikujokijevumuviruw.pdfIn PDF document text
    • http://msiutilities.biz/documents/gumusi.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/11002400621.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613525c4af2a0---raxipekavodasobiw.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/jexenulu.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/revezavikuvaxezujezo.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/66469824404.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/sowaluj.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/3528538167.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210908025836.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/89929122645.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/gavirofurefopizinugo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/56b96e73c0379fa8baebdfed2bbd5115/94007067914.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/35095976759.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/82341432523.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345644730c7---zonedewurobusevujefavuxe.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210902072249.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/kupimadizovo.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sebas.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/tivoruloguvefo.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5b7be734db621aeba88a0f677f91f9e2/budusabizutuju.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/pajegifuverul.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_off0000cd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD21 10896 bytes
SHA-256: 4066c52b766e1f9b003910ed30f7138535b9bc5ef9bc58fd207d1b521d2d11d1
font_01_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 18628 bytes
SHA-256: f11a367847dbdb1934c6beece75929e788e60d8aa2a196a22db55d01ac87a939

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