Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d5cd5fe561e847…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 21:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 178acd4a7c93b5eb5ea655fc8243b7d6 SHA-1: 3cb38cd8643d7f02f31acff4dfc8b6ccc4b50e64 SHA-256: 27d5cd5fe561e8477249dab507d3699e898fa6ea1568b78c20b9f15476c90670
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://worldcastlive.com/userfiles/file/14790205283.pdf In PDF document text
    • http://fabrikando.com/cmsimple/images/file/janenozazofatir.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/59aa659bbdc177e60b765f312632eb6d/bepusiriraxutedif.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/86082747938.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/dopusinud.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c194f130d---worosemenudoxivizogo.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210914031309654209yuetf.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/bilefatorid.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304b6def080---50789614872.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/78416339129.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/44493508173.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33831273025.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/sipuba.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/dusuduxemof.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135812f1578f---nafedajidelufota.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/wijitabegiropuxofu.pdfIn PDF document text
    • http://tzsunup.com/upload/navureravasojewiwowulozu.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/dowojizidat.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/wisosanexufimos.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/povabozatetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=large+ppt+to+pdf+converterPDF 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_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 10512 bytes
SHA-256: 364f9f3ac3a4e1277a6e0c7c76ade74d24846e2dc1d6638c21b5064d7edda8ad
font_02_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 19748 bytes
SHA-256: 34065cc75ea3085e25329550b79232bb59421c4379146fc1a4ef8d57e03d95a5