Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd08d715b75a8af…

MALICIOUS

PDF

95.3 KB Created: 2021-09-09 14:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 181862a4efc260645e802dc3221956e4 SHA-1: d50719b0f5983dabf7edce8bc7c9a4de1e05af54 SHA-256: 3fd08d715b75a8afd501b2b52ae0577352eaf38b373a6366b2332267e5897620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://garglob.ru/uplcv?utm_term=me+before+you+123movies PDF link annotation
    • http://jinyezi.cn/upload/bixojotisid.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613702ce8ea5a---2056362984.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/bokixozepulusunamedusuw.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/zozavapulazap.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/17090374930.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/sobakajujelafijiral.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/13723429422.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/8502787942.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peporiwodatabanoda.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/nomikewitofodesifetose.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/vazijogejabutamekareno.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/tejepije.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/rumusi.pdfIn PDF document text
    • https://elemonbg.com/Files/File/javexamotutovumopi.pdfIn PDF document text
    • https://andhimazhai.com/images/files/25207958789.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/539udb5cpn9qhmn474p2dnv24f/25286081970.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/tegadug.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/miwipixuwatasidumaj.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vivekisaji.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/mulavanu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a1429e6b55daeb8e69a4bda18f4e5e22/fowafituker.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/vazaxutadurojemu.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/46086923504.pdfIn PDF document text
    • http://orderkai.com/uploads/files/pesizuIn 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_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 20672 bytes
SHA-256: d84523fd8fdadba3cbc3bc9b8ab21a53e1789aeb8c77ad2f1810344a2346919c
font_01_sfnt_off00013eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEB 10720 bytes
SHA-256: 5a6b9de829020209af8a435ab8620bac219ed120e3be18feab6ac4ffba64094c
font_02_sfnt_off000157c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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