Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b5a0387b7eeb7b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-12 01:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 267c2af76c97456d6485f9b83912473a SHA-1: e7d3709e089f30857a6ab17b98fd32d6e48cad77 SHA-256: c9b5a0387b7eeb7bb2de66bf7fad51bd30c8ad78bff2f4848998f9bc7abb562c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various URLs, some hosted on compromised WordPress sites or disposable domains. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://archism.ru/uplcv?utm_term=rfs+download+android PDF link annotation
    • http://imosa.asia/uploads/files/202109040849241422.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/xewowakawuvujerokapu.pdfIn PDF document text
    • https://ms01bet.com/contents/files/14892992980.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210904_055936.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/jojufiwerep.pdfIn PDF document text
    • http://ping-property.com/user_img/files/riribu.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/90429235600.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/93053974445.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/36867840328.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/tomutamezimuvi.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/tojijovaxowa.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/musizaditok.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/71809320495.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/74840268454.pdfIn PDF document text
    • http://sro52.ru/uploads/files/36887779651.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/47625578584.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/rcq1gg7g7nlsp4kueimrmema30/37941520587.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161371875897bd---83802724629.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/jugosedimodazaboramawefi.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/zimexotarojoridur.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/5052307471.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vavipodidarevafakapifip.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/buwaxetu.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/13924816526.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/82107069376.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16131949ee6817---ziwar.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/givego.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/furetoxelit.pdfIn PDF document text
    • 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_off0000b63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 14796 bytes
SHA-256: f43e07336abc2c7932b6afa8a6275814992e309a84b50cfdaad2a4b543afda17
font_02_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 10248 bytes
SHA-256: ef95af83afa30fccb6a5723613897b8b3519f1d81f07bcdb3026f142cffe41b2

Open this report in the interactive analyzer, or submit your own file for analysis.