Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f456adec00faa6…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 13:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e69c64475fe37a0dcf4669e203440a09 SHA-1: 93d1ea52e272d3d3e816c3db01638643df44e992 SHA-256: 73f456adec00faa65fbf6f1db752aa04aa822a52a7cff6126cc29a0d3d132e27
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm. Several heuristics indicate that these links point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pixomot.ru/uplcv?utm_term=archos+7+home+tablet+downloads PDF link annotation
    • http://giayviettri.com/img-ftec/files/78178036580.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141c09a4a75e---delopow.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/salab.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/083208_zuwudip.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/mugojusufesufixefos.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/58935693800.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/6712012476.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/wolezodisofijukenofo.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/mexotufu.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/67752858934.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa34141c9---gimeritixifuxopegavuj.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/84271578505.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613551904ee79---65650606184.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/33652858889.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56489154880.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3cad39d7bce1e8b896eb04dc87d38c87/mapofewomox.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/41983440014.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/26944905363.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/47796458041.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/39309572851.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/mizowupika.pdfIn PDF document text
    • https://service-panev.com/userfiles/23034726611.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuguboruzaxozijirakamuso.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70378604723.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/6647815455.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/nasorotiguxelatonadiwonu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8a76d36e4d76411788a0a739c9d9fa19/10206499708.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_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 17924 bytes
SHA-256: 4abedd42a772e3a679ad3470909809667c46972b7de2acdaf0467d130d4c0938
font_01_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 10800 bytes
SHA-256: 615f171fb38fa122a729c36b525353956c0a2ea0db99b61b7554dd98b93b1d03
font_02_sfnt_off000136e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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