PDF malware analysis — malicious · 38c9831fc5d58545

MALICIOUS

PDF

93.4 KB Created: 2021-07-13 12:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 06147cb132803054780785d5b41c5e74 SHA-1: 80bebe1a5b6057b23cce8f44acd4eff11d9ca5ee SHA-256: 38c9831fc5d58545243bc3592e1cb87a54e669586c985b2af2629e626be41369

112 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised WordPress sites, suggesting an attempt to trick the user into downloading a secondary payload. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting further supports a malicious intent. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

Heuristics 7

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.
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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6f1bfc6a9237b61ebb3e8775c92054c8/xatiloxifutir.pdf In PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5bd712828---23590234771.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c13a6c53d---xalozadokuzalekupave.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e5f1a69af806f92a035f482b55314d50/sutojiwozusepirusazi.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a964a9f06b---36883714890.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090a30c89413---fexesisufizosumavaparadib.pdfIn PDF document text
- https://www.alitec.es/js/ckfinder/userfiles/files/gisaxalisesepebo.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7b99e9e8ac3cc50fe90c41cb96619e10/63043142756.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/dee1322f56a7e45c4001f50e2327ca72/40959605525.pdfIn PDF document text
- https://postele-z-masivu.sk/ckfinder/userfiles/files/vafelinubefik.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c082dcb8---54132737503.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b19dbdd0eb59af2d239047eada4ddc32/wavitixipufozelop.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fnhvvbpidblguottveb1pdv950/1380104257.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a4342ff9---nirixupufovifunonusaxixo.pdfIn PDF document text
- http://csc025.com/userfiles/file/20210706184237_gdo9vi.pdfIn PDF document text
- http://glotecgh.com/upload/editor/file/lokapadopevezegozena.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/93a0d4c19e2cec9b52720f9eb718079b/84003598512.pdfIn PDF document text
- http://samuiluxurytravel.com/Uploads/file/wesoxokomozunoxalibiwobop.pdfIn PDF document text
- http://70sromans.com/clients/871711/File/pudepegamixorarigadejiziw.pdfIn PDF document text
- http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/16594606057.pdfIn PDF document text
- https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/90bafbafed607e81447e23a9eea2ef46/xevakekagirinowaredono.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a46bcda36bd---89556678606.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/nokorejel.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b26465bc---12563921143.pdfIn PDF document text
- http://baraanduliaptti.org/userfiles/file/kibazerunagipajekerixagav.pdfIn PDF document text
- http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a364db09---57570947594.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2338862558de653d170b9b113e4c9d4e/bomilokezukimeb.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=solid+streamz+2020PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f441.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF441	16140 bytes
SHA-256: `00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b`
`font_01_sfnt_off000109be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109BE	10684 bytes
SHA-256: `0a363a82897ac32e55aeaf7e316baa3ef5c89d75173361eda26bcec2a42a196c`
`font_02_sfnt_off00012250.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12250	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013a62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A62	17432 bytes
SHA-256: `476830a7900b7f4c9b35c1f9a24ca27872bbc19b9c773574f8e132fa28a56342`

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