Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e21b8222a1a901c…

MALICIOUS

PDF

72.7 KB Created: 2021-10-06 12:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f348c64757652232bcba21cb60a95f77 SHA-1: 2bf36ee24da350699a218a5a95c6279ced5d96be SHA-256: 4e21b8222a1a901c8ccd5054e882108857e53e7c53eea3c2758ea6214e8498ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://darshanam.com/ckfinder/userfiles/files/rarefisekenunusejaketaze.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152932507da1---wonopipepisoleke.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b9a2e7619---75071161679.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/lawipinu.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/57562720395.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/juwuvanemipi.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/74149356035.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/26888923342.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109290543099145.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f34f64b1e7---41137654479.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ruh2igbn1pvvroseqih6mimpj3/25141675123.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/48113144177.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41041940842.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/83460453565.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6c645717681fd51795bc6223b8389dc7/xupekab.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/93551608039.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/88260375282.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/99043521460.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/lolom.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109242110003437.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140087551673---41011292084.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/54694737428.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26223337551.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wunuboku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=forensic+science+placements+abroadPDF 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_off0000b8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E5 17184 bytes
SHA-256: cef9c1fdd08d7658903602e0535c00ad355d99e140e6af859570c3d6c460c911
font_01_sfnt_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 10792 bytes
SHA-256: 163a320b70edee0455355c994f14ff39d2ed43568de4437cb805423be59f7140