Malicious PDF — malware analysis report

Static analysis result for SHA-256 752b9b2b6c78f888…

MALICIOUS

PDF

91.2 KB Created: 2021-07-24 11:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13d1c3d17387f84a30d0c46a12dbeed0 SHA-1: 63e2dfe2114e11e6e539574432e9b3b8d8c34c9a SHA-256: 752b9b2b6c78f88830f91421a7912e94ae48eebae690d2fe62084aad1818dd22
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and other potentially malicious domains, suggesting an attempt to redirect users to harmful content. The presence of external URIs and link farms indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fed3a3a4914d0a21c7366011e02b3c09/44637628815.pdf In PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/10513128455.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021072314350173499.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/tixepaze.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e861b2e416---xibodajotizoriwoxigupanez.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/883710b55244db4baf584f89fc5224c0/20003330665.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/34615286414.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/76440183180.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a5ee4791ab5eb58947d685f9418dd47f/wevoxudumisib.pdfIn PDF document text
    • http://funperm.ru/content/file/19517180200.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/74552292658.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/24049370106.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/tixotemudumumatukubu.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/narikekajelojokelasuzego.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/gofiweg.pdfIn PDF document text
    • https://x-software.cz/data/file/bubozifuzigajoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10ecbf109d---jazewaluvedoxi.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/bekagajadipaxezoxixi.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/zuxasotawazedipiz.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c410956500---9305047712.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/10f8ed5fed84e404132f92dda1e94ac8/59757278481.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/61829579855.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c345dd7822c---57873705907.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/korupavedakudixemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=successful+polish-english+translation+pdfPDF 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_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 11108 bytes
SHA-256: b09e123950c066ad96c1728d97469ebae686449c5be40d5729aca5b67e061db5
font_01_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 17988 bytes
SHA-256: 9bda2b86647eb80a59414913857dd7f148a3e82832254e3f7eefca901be77c62
font_02_sfnt_off000146be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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