Malicious PDF — malware analysis report

Static analysis result for SHA-256 751cfd7e3cf5ac42…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 21:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d999f98036f99e9f96b4885aa5b156cc SHA-1: 0e3ca350c45295a6fc789b0d3fc66ca1af4d26f4 SHA-256: 751cfd7e3cf5ac42ad85fdf6da380f9e93161a4ebddb649741c8f4d9ad4a1f10
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mobile-translator.eu/app/webroot/media/files/salowafun.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mv91s2c9gvn2g9muakhke06ma4/nawiludizijedadutos.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/20300193045.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613d081a2749c---jobejefutanoxanibemixuzos.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/16908951697.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/nakojaxe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cba4d53e9---polurosezurisevejupuvaza.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/nugux.pdfIn PDF document text
    • http://kyea.org/imageuploads/jusamin.pdfIn PDF document text
    • https://alutat.com/data/file/xelofowiw.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/88694520450.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/45136056595.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/tukemipuv.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/siseze.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/96159001572.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/rupifera.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/tafesiki.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe9cd3f75---xefebulafuriv.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///99565043093.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/vukevuwemajoxa.pdfIn PDF document text
    • http://lgassociates.in/uploads/roroxolukebufuluzabeg.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726c9d16da---28261968897.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/50987395067.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164b13b210---kakagokarimemolirubemere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=romsmania+pokemon+heartgoldPDF 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_off0000bc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5B 17240 bytes
SHA-256: dd760ac0f4d5a527e6939f36c1f5ecd658ff46740b74ce6309823f4c944b1556
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 10976 bytes
SHA-256: 0a4a095d92a64e8172458e18d608f981f5caf8b098bba0507ed24927010553b2

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