Malicious PDF — malware analysis report

Static analysis result for SHA-256 d399c6079c538359…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 10:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26b99e43bf88178f364e97deebfc1077 SHA-1: 1ba945e2620a59f99daa9147e77cd0314e313b01 SHA-256: d399c6079c53835923d3959674b9920c6dd02a010e5d5423d05da1a9d95f3a6c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation or to distribute further malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, likely contributes to the malicious functionality by interacting with these links or attempting to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

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.
  • 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://kitapkaplama.com/upload/ckfinder/files/boliwunonumamoguz.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/1821027096.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/vulirumagumumurisabo.pdfIn PDF document text
    • http://www.og2c.com/images/file/xadanimiberapefababog.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/labexosa.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/10052929407.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/42692183350.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/susuziwajunigesukojolozuk.pdfIn PDF document text
    • http://albachiara.info/userfiles/files/fapoxusazidokonudexeba.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/85209917177.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a88ba9148aba449ef52ce1e90d5a3256/77675880318.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c9d1caa8---51082633794.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/zajovisotudepuribosagaf.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/7296726357.pdfIn PDF document text
    • http://citty.org/images/uploads/file/7995003843.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/39042492710.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/vuwodupulobeluvitu.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/takafo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/pemosawepizesu.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/35354714100.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/kulovemezirukefoduxudi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161325537132a7---bulamamupelima.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/45132025581.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614812e5806a2---96736654695.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jolugorulikisova.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/xabejejarimu.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/demasujasozivepil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+call+recorder+app+freePDF 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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 16804 bytes
SHA-256: d42893e32cf0a2def34cfa031d61a727eafcb989e6dc09e15154e57e71b1c23d
font_01_sfnt_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 10472 bytes
SHA-256: 126af061748ba175e3c05fe4fc1c90e4b80ee393a8586f9b9196f8bf1b9c6f9b
font_02_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1