Malicious PDF — malware analysis report

Static analysis result for SHA-256 caddd6b1f4fef22f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 13:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2741f7195aaea093a230b7fa34fc0297 SHA-1: 0ab6166fd7dd373b50afcf451acd77103ff7b985 SHA-256: caddd6b1f4fef22f0b2e450b56afe057fdd16fdbf86b586e34a5e98c82743d56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=find+equation+of+parabola+given+focus+and+vertex+calculator PDF link annotation
    • http://gzhangqin.com/uploadfile/files/dugivamore.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/xoxaludedixojige.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/55950132489.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/34962731553.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/foxurogitikobataja.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/zoxazobisagoxoza.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1426c7ddc9abdd0683dad31936ce9b17/pobesumuxeb.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/zuseminepexajebubeli.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/10924933200.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/fukiza.pdfIn PDF document text
    • http://www.farimar.pt/imgs/uploads/wukiladozogel.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ieonftaj21nmsjvvscvfmnq99c/79034092996.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419349a25e2---worafupubaronezo.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea25763e7154d646927aff20fad1ebd0/24521952339.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/xeroxolofawovotim.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/fasosovawinugatemefene.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/20883010718.pdfIn PDF document text
    • http://ridendo.cz/files/file/jomusi.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/vimemisozom.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/93272746652.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/dedoxalebi.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/48680737614.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/nezenifigidevukop.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/fojabotazulomifodorej.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/guxegepiwijujirapas.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141524c1a380---2491264287.pdfIn 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_off0000c006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC006 16388 bytes
SHA-256: 3a87db69f2dc3bb21e16b479194528abaa0ce9a09f46733adb5fbe9696768bcb
font_01_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 11328 bytes
SHA-256: 669f3dcdb2503c5f8dec6f44379f87fcc1103a991b9bf100be96045ed92adb38
font_02_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1