Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc1e30569cd46da…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 05:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80e6736473cb8d4cca7ff258579182b8 SHA-1: a3d4fd21e698a320e0ed874f2e944c2ac1ff5a5c SHA-256: 6dc1e30569cd46daba39edd01ff7d4c24366a505429e8375c4eec2f193024fcd
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document exhibits social engineering tactics, specifically a 'Browser Install Lure' and 'ClickFix' attack, instructing the user to install a fake browser update or extension. This is a common method to trick users into executing malicious code or providing credentials. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or phishing lure, potentially leading to further malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://tpdw.pl/userfiles/file/5542860128.pdf In PDF document text
    • https://contabil-fiscal.ro/mm/file/4775619262.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/49512019814.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210918_BAB1C85C18F01055.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/73523141148.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/funemudi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9c3b4039---32801000063.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba40e4c92---kuraku.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bedef5fa0cb181aee6446610e050888b/vadupuvuras.pdfIn PDF document text
    • http://webs123.com/userfiles/file/jevezagemi.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/54345919642.pdfIn PDF document text
    • http://unseretochter.ch/images/file/42344728187.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/fiwufijupokogo.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/89364268106.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/pezewebus.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/voxujixifetugorukumi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613290d764061---lasasatozexejovumiv.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/62713237092.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/ruzafedalu.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/13994599755.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/lozedesakilovebezapid.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-17/20210917074559598442.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/94041554055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chrome+turn+off+dark+mode+windows+10PDF 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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 17312 bytes
SHA-256: ea2cac7ee56c876cd77685d9a5a35c4e083825355dcd292a8a3d14239e0c3852
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 11056 bytes
SHA-256: 19e12bf294d606f37fcd6f80dd689000469d80d012b245e6c3fd35f9471feefb
font_02_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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