PDF malware analysis — malicious · 5f3ec9d07e975dd3

MALICIOUS

PDF

89.8 KB Created: 2021-08-19 17:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 3421b7b996c64a2674ec7034c8599ef2 SHA-1: 1c1d8e45a19890ed42ef5efa1adddaabc22a9a97 SHA-256: 5f3ec9d07e975dd310876c2d5160acf359ab8d85501181e2e8228165ccd82221

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of external URIs and link farms are common tactics for distributing malware. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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://crewmak.ru/uplcv?utm_term=tamil+nadu+chief+minister+list+pdf+download PDF link annotation
- https://feldmann-spedition.de/pics/userfiles/file/monomejalezomix.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa21c514155---52821109998.pdfIn PDF document text
- https://egyptsuntours.com/userfiles/files/27115995829.pdfIn PDF document text
- http://ukicda.com/admin/fckeditor_upfiles/file/2021072619451280554.pdfIn PDF document text
- http://k-souz.com/userfiles/file/63819696248.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b808cc6fd484b8cf83e96cf83524be9b/zevelifeliwevavafu.pdfIn PDF document text
- https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/33287a75718d7f4da762bcf047a295a8/34958799520.pdfIn PDF document text
- https://solidpractise.com/files/userfiles/file/19375949645.pdfIn PDF document text
- https://weeb.nu/userfiles/file/52858940583.pdfIn PDF document text
- http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/fotide.pdfIn PDF document text
- https://alnahamgroup.com/userfiles/file/43427519603.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16109ff04c60b3---45278015504.pdfIn PDF document text
- https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/539fe4079ecb359d56e7ecba0dfa8bb6/86713982571.pdfIn PDF document text
- http://ketoanaca.com/uploads/image/files/15530363637.pdfIn PDF document text
- https://legend-chang.com/UserFiles/files/merepovudopezanajifu.pdfIn PDF document text
- http://chinamakina.com/userfiles/file/pefap.pdfIn PDF document text
- http://caratow.nl/userfiles/file/27020441454.pdfIn PDF document text
- https://tempegaring.com/contents//files/vijabipit.pdfIn PDF document text
- https://proektasis.gr/admin/spaw2/uploads/files/zonikizogubi.pdfIn PDF document text
- http://anatolianlgs.com/userfiles/file/4276274115.pdfIn PDF document text
- http://naturallabs.fr/userfiles/file/nogiviloxutowezeguje.pdfIn PDF document text
- https://vatlieutaphu.com/upload/files/minotidekezojixegolesux.pdfIn PDF document text
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/869b0110134e218308ed6dee1173e2a0/rekiluxezo.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160797102a46fe---fafewokuf.pdfIn PDF document text
- http://pp-aqua.com/userfiles/files/sezeritoso.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e683.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE683	11036 bytes
SHA-256: `7ae644e48ef7b9213639603226776fcf650c46f6be34a3987bc2a7520e57de1a`
`font_01_sfnt_off0000fffe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFFE	16228 bytes
SHA-256: `f2666e95f4599b990980a0abf2f374fe3006e34437484733904d739abeeb93bf`
`font_02_sfnt_off000115e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115E2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00012df4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DF4	16140 bytes
SHA-256: `6dacf174642dbdb2b2a39a10c060f17af7782fc0d63c58a8a27917618fc39250`

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