Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b68695e8c8418f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 04:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b335584557b4b3be4749dcc07ee9706 SHA-1: bce09e6d4b5ef2964bd39328841f27ebd2fdde43 SHA-256: a8b68695e8c8418f18ca7b5f68d323d9670d090f14bd38ea1f9865f93202984a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 http://rsport.eu/yonexshop/static/file/38169854648.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d69bed27---dukidelegopidoxodolujorok.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/datarolevoge.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/legamakoxasekesob.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/36744c8fc81d2c30e10c4a0e349f99d2/nabivofiz.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/bedigeluzorisi.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/27483378281.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e9f82a596b337f46eac24a062aff965d/38550137550.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/50611141831.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/kuzivivotufuselujur.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/fewak.pdfIn PDF document text
    • https://rajaunited.com/contents/files/lewek.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/potefujebefukibabawizeje.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jalidepigidigexulevoreraf.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/loluveneb.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/51978248604.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/medovu.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/94247997772.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/jivalajuwoxoninamekosuwuk.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/32902699378.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/98864269023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+hide+whatsapp+notification+androidPDF 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_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 18744 bytes
SHA-256: dfef69820a471352582b129d1c16f641ab269b77ba778bbf4cbc3a3c766c758b
font_02_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 10748 bytes
SHA-256: 6a3ce19ac93b1e19bf58e3cf2c0e861da3dd1097f0ba2defd4db2cfcc3c7ba1e