Malicious PDF — malware analysis report

Static analysis result for SHA-256 89429707a9634f82…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 14:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8968f1bbc295e98171ffc35f8032ce4 SHA-1: f5fc6aae93955d40247e808aad4a52332142a32a SHA-256: 89429707a9634f82b470044c2d424ab60f373fd5259d279022d19478bc2c7ac3
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS upload directories or disposable domains. The ML classifier strongly indicated maliciousness. This behavior suggests the document is designed to redirect users to potentially harmful content or phishing sites, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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 http://harlit.com/ckfinder/userfiles/files/20210904_150120.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161376f8ad7116---kiziz.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/52343212026.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/tezitefageze.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933a8870a9---fopiredolurezu.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/32711608847.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/xufowofadogizilalu.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/36056856522.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d77be7d07f---53972440123.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/tepapigasebajozov.pdfIn PDF document text
    • https://istanajp.net/contents/files/47638999486.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3e20b9d10c763f726b6b26c9977a84f6/vedifunarelixafe.pdfIn PDF document text
    • http://lamay.de/userfiles/file/78952492464.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/lajatava.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/28910571628.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/78789913220.pdfIn PDF document text
    • http://lecostationery.com/files/file/rifuzikatapelisoruku.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/tamezunotiwusaxasopufinud.pdfIn PDF document text
    • http://domosplast.hu/files/file/borulekaxonuja.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/43289725280.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/32239282973.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/23523521410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+root+explorerPDF 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_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 17568 bytes
SHA-256: 50a0c586365639763a3db841cec749cb4ff4ebe63bf1da2cc38126398127de7e
font_02_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 10040 bytes
SHA-256: 126de941463b34ace4ff5791591bbd8909778e6fc03fc77266187b391d6160e9