Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf4233e9cc00911…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 19:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50d80ca563106c99dfb4d1d7a6ab560c SHA-1: d6dd56726661dbee92e36580e2cea6baa20080eb SHA-256: adf4233e9cc009113c08f1e2a8e4913898f0275b205e670bbfb83230358c276d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs and the PDF structure suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b2b8aeba---jakadexejigavarexinuj.pdf In PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/85183696155.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137c22886f78---750257260.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/pesigugab.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/9463339196.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/80351882853.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/79291531671.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/bugopepiwikeladuma.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/16779934404.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/vizepudemo.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/16368747258.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/dizanexudumegiwagaj.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/60381126566.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/87008075108.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/26320717262.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/61004341767.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/63774783622.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/virovajowedozofamabilopis.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ef726a19a8a2ca557af9bec2f4bfbfe6/molobuk.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/famodetagop.pdfIn PDF document text
    • http://lulanjina.net/upload/files/39202554183.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/xodovadigomekojusogemid.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/jefilitofuf.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54619113628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+photo+album+app+for+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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 11056 bytes
SHA-256: f9486e13167fd03a6dfe00168b463a78b47f8e7861d67f12d9597b55548576ec
font_01_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 17484 bytes
SHA-256: 511ebba1a53a2e554901dc93fb59423d8d8109948c6f455e205b0e833a263a24
font_02_sfnt_off000126d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1