Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ac6b5401c45777…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 08:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8bd9db72a56ad376272ce0c46654585 SHA-1: 0976ea48bc728c6b31ad9108ba7158602500617e SHA-256: e4ac6b5401c45777b2a1e23178e1291ac900bcaeb95ac2b28b941520a3201db7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The primary purpose appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bodymart.in/ckfinder/userfiles/files/waninabidukonusule.pdf In PDF document text
    • http://ceramkgres.ru/userfiles/file/nepunimufezidi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd8e6e9450---26906416910.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/5131888885.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/36322896652.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/81831062156.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce7b47a28e---20972822528.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7b85c9a460d946b0e7afee9ddb44a9df/22854368999.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/94860570627.pdfIn PDF document text
    • http://yilip.net/userData/board/file/nirasox.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/25641988885.pdfIn PDF document text
    • https://masukpt1.com/contents/files/14769898965.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/78590270961.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/jalobenofuvaw.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/posebib.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/caa8e51e48de831773d7c49c5ab5d963/pigugapowozidudamodawimo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/574e1fe59338549984b4bcc951d6039c/79735988246.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109060930567443.pdfIn PDF document text
    • http://bptramptour.pl/files/file/46628654681.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/kagoguferesevam.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210920052941.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/jesabewiluxunexowus.pdfIn PDF document text
    • http://18554080.com/userfiles/file/tuwunuripaf.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/46100573432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=night+light+apkPDF 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_off0000aeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFF 9976 bytes
SHA-256: 3a88f11137a0b6fcc73c045a67ec21e67b03c19b8ecd961926e748725f015c81
font_01_sfnt_off0000c52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 15252 bytes
SHA-256: 150b2dfdcac15272356b5280b6a3d28f4d2d7297d426ac6f2e4066abe4a90665
font_02_sfnt_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1