Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f166dde3abcdd2…

MALICIOUS

PDF

90.2 KB Created: 2021-08-03 22:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5bd49600ba65e054f3bef13f9a5aeca0 SHA-1: 09599c1701fe59b6179decd3f6c45af787798bd5 SHA-256: 38f166dde3abcdd260ca602515b87098378497f3c9c8fbcaa5c23603acc11486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://depcip.com/app/views/panel/ckfinder/userfiles/files/xumubawewuxibem.pdf In PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/40538357558.pdfIn PDF document text
    • https://norservis.com/files/files/mizoj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160870f94c4e8e---80918617644.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/49603394020.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/14550286063.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1i52kf2sk2f73fg1ulado0lf00/77214798375.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/sizanozuvip.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/garukebavi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98b44b667---30395645823.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105261022.pdfIn PDF document text
    • http://cosyromania.com/media/file/pelopesegerowujufijopo.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/vosive.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079265088da8---wirurijekikixo.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051823441080.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f1e02f8c50aa55945fb75ccd002e97c7/39774326033.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/pomafakenizagawuzutufori.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/90953728089.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/xigezuvud.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/43118362987.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/2972574515.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074147f4c296---roxawetuzalufu.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/mjilip9960asvv2jf710trfn60/1696813625.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/78758842668.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/161e786cc8eca10c2053cdad07edbc57/wudewaziwazijidaxafuw.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/46556362792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reset+navien+boilerPDF 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_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 10384 bytes
SHA-256: d192d20b38e4481292138eb81e5e3007bc1ab982825fefce01ad1cc80bf632ae
font_01_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 16452 bytes
SHA-256: f3f098300508dbb7678fcda064401c2af7a3a4b3850b9e1addf8181c31cf667f
font_02_sfnt_off0001428e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1