Malicious PDF — malware analysis report

Static analysis result for SHA-256 67849f04b812306a…

MALICIOUS

PDF

86.8 KB Created: 2021-07-25 01:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70467dfe3e64fc90b882eee4259ea41f SHA-1: 66b7bd53568ad65d811c5ff2e5b6e6fdb0e841cd SHA-256: 67849f04b812306a69d837c3a1ad5fc7f91b925e601a4bf86abfd67923d37ab5
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update. The presence of numerous links to potentially compromised websites and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the document's structure and heuristic firings suggest it is designed to exploit user trust to facilitate further compromise, likely through the execution of malicious code or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502131542337419.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee27e1a83---29498879584.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/138e34a08044c87e7dc82ab6b6cc2c28/24559438585.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/42633441359.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/kifepakutorabowurava.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/53974937141.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/lerowevonorogitepunataxum.pdfIn PDF document text
    • https://agatanorek.com/files/file/zozigirogemabejinura.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kozefezamafet.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/9867933867.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7d834a961---gepanelumo.pdfIn PDF document text
    • https://termofriz.rs//files/vosuzuvuledubi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160851991028bf---33188519756.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8116b21d8d1e5c0ce32dfc577a7905cc/logob.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/46076243082.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/lenigojaso.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/fd8ed48c3ae21bc61cd2494fede1dc5a/pagemad.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/899ab7e25f0d1d79affdc9ecb7314f79/66744819811.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/54180845079.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/95321203686.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/bafufasuzokojixipox.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607787dfb87e1---73190319820.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/84584198113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kahoot+answer+hack+workingPDF 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_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 17196 bytes
SHA-256: d29ecd2ae2c0ced5460c3a180b14b79c994149eb48f0230ac6f7487b829cffc5
font_01_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 10632 bytes
SHA-256: 24c0cd0cba34ebc670dea75f49e4c5dc70264ef0ec2ce3521ecfe3d50222b69c

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