Malicious PDF — malware analysis report

Static analysis result for SHA-256 2083e1ce259b914b…

MALICIOUS

PDF

93.2 KB Created: 2021-09-05 09:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5b9649c955c3faac9c3bcb9e8d56b1b SHA-1: de05071f09f1d37324cc8d177ad43a40c1b95304 SHA-256: 2083e1ce259b914bd2fde59ce7befbed91ec8dc8badfab686853aebc244e2aa5
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a remote-support tool lure, instructing the user to install or connect with such a tool. The presence of multiple links to potentially compromised CMS upload storage and disposable hosting suggests an attempt to host and distribute malicious payloads. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of the user's trust to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://medtek.vn/storage/file/1164800934.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/lk2v70gsgdqmmro26fb7j6rjm4/nojojavigakisevav.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107f08528ad8---3265965148.pdfIn PDF document text
    • https://ivanamihic.com//files/81802756098.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/22653300605.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c0c4f328472879a36eacd87c807274c/87838232905.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/kulowevote.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/53664278066.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/xizinidutaxejovaxudolabox.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/18vo4ojgtgnm7qhe5nva7scmcm/7785499898.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/48bb93d3e93e321eac2c6bdf56ee1c39/48778863512.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a2213540---fodabapi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b58bd3139---58469454912.pdfIn PDF document text
    • https://digireg.es/upload/pawegemowawa.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/22/pubapigewobip.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7b134d76ccc56aaf19b31687438953b0/32845920381.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/73707251776.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5viduio0nim1lr88cjojodakq/68215295565.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jusedevakugapulupano.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/segiwigupa.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/tesopodatofumaxi.pdfIn PDF document text
    • https://hoongnau.com/upload/files/gurowogusiregafefelev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kalender+september+2018+zum+ausdrucken+pdfPDF 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_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 11452 bytes
SHA-256: e71660ff45578e579be451da638d7c1a94045770482c3aa7403138923f3bfbb5
font_01_sfnt_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 25696 bytes
SHA-256: c5d5359a357e163d93af886030ebcce3ddf10a07a87155d92d9d714bc5a9996e
font_02_sfnt_off00014de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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