Malicious PDF — malware analysis report

Static analysis result for SHA-256 68306ddefb73eba4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 19:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f816b5743ddbe9e2060fc3cac91abd60 SHA-1: 823fa340ce74953304fd3cd91cd4799e0d25cdca SHA-256: 68306ddefb73eba48e9c1ccc474f8e9f81110924d62a67aa684f848a75bbca00
104 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of a 'download button' lure suggests an attempt to trick the user into downloading further malicious content. While no scripts were directly extracted, the nature of the links and the compromised CMS uploads implies a potential for JavaScript execution or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+know+profile+visits+on+instagram PDF link annotation
    • http://smwiarus.pl/ckfinder/userfiles/files/kabutoxuzazuzaroxebego.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/mitimitilesuguf.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/15215762516.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134de810a35a---ronimituvo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9ed50ca6a383934731ea1d0fe7e35516/7952302940.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/labideginazedixo.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/pezuzowiw.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/ninosagavetasisuluxaforan.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wisikamiterosagob.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/ledofiselumugexuneja.pdfIn PDF document text
    • https://longhoang.vn/upload/files/20761655837.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6cfb04b50ef3f124c82310db7d477984/56493164280.pdfIn PDF document text
    • http://huntland.hu/upload/file/sorevag.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396062ce679---saxekarovukugosidiv.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140d65e76de7---xonavoz.pdfIn PDF document text
    • https://limadelimon.com/images/file/73066262055.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kaxidaxotuz.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/venigabunimiwotoridu.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/bubupokagitada.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0a0dca0a---8879983353.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/widilovevirifuwiza.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/tuwotudeku.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/rokuvav.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/tajibov.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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 10936 bytes
SHA-256: 02aa1108608def3b76591d4dd3208369fd2a837be321550f3e4c9a56f50eb4cf
font_01_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 18528 bytes
SHA-256: 9d320a011cb3ec8d8eab07c8b0e51b47be49d90d6319416b2f0dada63d56f8f3
font_02_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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