Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0a27e53e439bf4…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 05:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36b90dfc08c9692a24ee5b795fb6b12f SHA-1: 76b5e6cd93863214430b09653fff1f2828f89c31 SHA-256: fd0a27e53e439bf4be7da836ebbc8da83f67af92c829289eef10735889e3868b
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tandartsindex.nl/images/uploads/sejadumuwobe.pdf In PDF document text
    • http://hoanhaochemical.com/uploads/files/32245358430.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906210824.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/dusilanomu.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/gujov.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/32640735405.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/josefaporikusasuvoviw.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/zejikizidor.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/kewadowisu.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/97028078826.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/11676411924.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/gevokedasozevijosal.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2ba824bcb---pumevifagunozomijuzen.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/68914572918.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0376a8f1---luvulaxirezewogisom.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/pabelomeruparifejiduw.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/51518e87c112fad7527ae73352fbe46e.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/55805335513.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/57123002042.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134eaf1cc340---15624884892.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/25720845415.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/80302092778.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/ririmalobujodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+puk+codePDF 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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 16892 bytes
SHA-256: d51e2f2101817171420a585f064217fca2bcba4f3da5691c4c341841cab7016f
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 10204 bytes
SHA-256: 3ef11cbc61013fa0ecddfb9debca3bc668c8bdc2cd71ffd9729c02a3f8002e19
font_02_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1