Malicious PDF — malware analysis report

Static analysis result for SHA-256 36349d8c4d7b3eb3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 10:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 623e2365afe8b48d321e477697396ab3 SHA-1: 4aff66c75356ec8b0256aeba5bf61ecea1e58236 SHA-256: 36349d8c4d7b3eb3cad1507fc642cbf7940f9bbbd92211ad0315e50845ea5882
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/16d0cddd0e019123839c4fcf693892ca/5046886118.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf8d4e7f7---71937116696.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/47277263673.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/29807825118.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/luligizegosi.pdfIn PDF document text
    • https://cubic.is/userfiles/file/47074205534.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070bac780be1---30754651319.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97033826055.pdfIn PDF document text
    • http://e-district.org/userfiles/file/35979469843.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/19560392835.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/bawitupoz.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/perepirazazexeverox.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/dotagon.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/witesujijurovo.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/5114100995.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/xoparejadijamolibur.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/zazak.pdfIn PDF document text
    • https://forssh.com/userfiles/file/1194592732.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8cba64d5---43030058128.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2df683cd0c6c234d5dc1f92efbb9ae1/9748478343.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd517d2d9---11053474479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=distance+vs+time+graph+constant+velocityPDF 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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 11000 bytes
SHA-256: 3e61a8569130bba915bded5af4957a837e34e68b698b4ea833f3a8d8733e2aa5
font_01_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 18684 bytes
SHA-256: 3f75a58721bed7973c08971ad42cc17f0651c91d2b86007f42231f828aa26c3a