Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac7ae3e59c1540b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 22:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 412401cb07163143b8b6169c1d8a4781 SHA-1: b5bd4e8863351ed2a21cc69d11b52d976182450f SHA-256: 5ac7ae3e59c1540bd75e93a372ae49d016db11b0d01cd70bcc2e28379a82dbda
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 compromised websites or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely serves to redirect the user to one of the listed malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=inheritance+patterns+worksheet+%232+answers PDF link annotation
    • http://deeringbayrealestate.com/userfiles/files/savumubiviximegaxe.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0d6457f969b3a58b9e3ad6109ebe80e6/85038163153.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/sijozozunutomilora.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/40748049667.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20199349477.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/90166331980.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/kakimokikiraj.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/95679307705.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/snj5669gqndqg2jq6lv9amc4hk/80505017663.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/21189635996.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/78953091447.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/56335900977.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voduxilarofafaradimun.pdfIn PDF document text
    • http://www.puhito.hu/uploads/59006768597.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b072860becc---woruzuzufiwubud.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/77713731829.pdfIn PDF document text
    • http://coolscape.info/images/files/298880913.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/27339203311.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pg407tbnnjd0mnlmd77m0eqrri/suwedagivefudajalenowif.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xomotujigefebe.pdfIn PDF document text
    • https://digiconelectronics.com/media/23955166159.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d78dfd95f5de64d5918bf68a9a3091c7/66775850462.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a085a787b8425bbcb55b92d383e749c5/10954782875.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3c18c5c319a082c7e19f0a34e47c2803/fasotosasariperena.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/40816405375.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_off0000cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 17792 bytes
SHA-256: 1a6e944778e0c0cff902a9235d063a07247cc672dd41504f21ef3da78f438ec8
font_02_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 10556 bytes
SHA-256: 52aa9a5fd73ebf896900d705da11505871cbdd5bcd1ce00d81555a555cceee32

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