Malicious PDF — malware analysis report

Static analysis result for SHA-256 66974348d76c48ac…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 15:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f4bda04255b76902105f15c96ae48a3 SHA-1: 0e4f1c1f6c1f0042c014ba642b44e5e3b0c7bb92 SHA-256: 66974348d76c48ac21cc314a43a7bd0c9127511f7a52566fb5175025c98e9cc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=negative+words+that+start+with+e PDF link annotation
    • http://koreadramatour.com/FileData/ckfinder/files/20210904_02C5CAB5358CC72C.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/48060671555.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/nofumefuvufugizusoravutem.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/77244672180.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613691e385218---wumikavojokurinekoxe.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/65657297587.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3a2535392---sezedobikolivuded.pdfIn PDF document text
    • http://julianina.dk/upload/file/zojafe.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/44258787016.pdfIn PDF document text
    • http://surausa.com/uploads/files/pixojivuguxo.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/mijamekepome.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/retawavixozupusiguxobevot.pdfIn PDF document text
    • https://clove7.com/userfiles/file/68558672382.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/tosipajiniku.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/23180357086.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/74055497545.pdfIn PDF document text
    • https://kar360.com/resimler/files/57663200510.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7010fa84096c8ab8c4f7f5a3c809f307/37859249804.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/1813871415.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161487710caae6---45019710082.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/48f03f77007b9eea52d2fc8be8c144a5/22092687881.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161426ad26b43e---gufiwekenuribojigel.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e365eb9c6524c2f5e56e82500aff02ad/rumowaz.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/49635273303.pdfIn 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_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 18540 bytes
SHA-256: 2e42ebd87712e3693b75b430f779f43eb3e7b292d9ba71e6e241ea74f55372db
font_01_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F9 10504 bytes
SHA-256: b053b5e3c95815e9b171cfebcaf24fbd1baf8b6d039af4dce72a13be1bed029f

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