PDF malware analysis — malicious · 5070c8e176c87480

MALICIOUS

PDF

70.3 KB Created: 2021-09-15 12:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 3342583729e15a7df8dc91e1a539f162 SHA-1: 2cdd16a15f883ee9f0e9480381e0b46c3d12a58c SHA-256: 5070c8e176c874809f7a61b0ff8f013cc78b748192cfdb0bf70be20409d57ae8

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the heuristics identified a link farm on disposable hosting and compromised CMS upload storage. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://ongxoanhdpe.vn/upload/files/dixexubomutukepure.pdf In PDF document text
- http://www.aragonemprendedor.com/userfiles/files/86128832628.pdfIn PDF document text
- http://lica.plovdivweek.com/js/ckfinder/userfiles/files/zamubif.pdfIn PDF document text
- http://hongphuc.vn/userfiles/file/dusanufosagipelusimas.pdfIn PDF document text
- http://gewoongroen.eu/app/webroot/files/userfiles/files/sapukawamuzijeremoka.pdfIn PDF document text
- http://defhjdr.friend-match.com/upload/files/37505665781.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/763ebea5aea2aac9ffa4fa2441bbb243/zogejubusigepiwejuzaz.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/2525557917.pdfIn PDF document text
- https://termofriz.rs/files/74756174219.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393854481bb---gawajafenudimanige.pdfIn PDF document text
- https://smwebtechnology.com/arishayurveda.com/userfiles/file/72821660265.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fa2b0387---27537938591.pdfIn PDF document text
- http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161359b0a945f9---85074475129.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/969a679852a82237e98fcae7509d863d/65608184327.pdfIn PDF document text
- http://gerocuki.hu/user/file/53178796342.pdfIn PDF document text
- http://tostonet.cl/ckfinder/userfiles/files/kobawokidaluxupegulepo.pdfIn PDF document text
- http://maschimaurizio.it/userfiles/files/sakuselexosirebig.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d81c4ce6---18300057928.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132950046999---95806904891.pdfIn PDF document text
- https://sportnazona.bg/f/uploads/files/91571935721.pdfIn PDF document text
- http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/nifuneku.pdfIn PDF document text
- https://xnkvinatimex.com/uploads/files/77137040209.pdfIn PDF document text
- http://restokrat.info/userfiles/file/53595739226.pdfIn PDF document text
- https://floridagreatescape.com/media/file/33610232092.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+game+granny+smithPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b4d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4D8	14940 bytes
SHA-256: `e2890872d188142363c6ad42c094707bf5aa403a4f61ab4b959c3f6051c01e2c`
`font_01_sfnt_off0000da51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA51	10896 bytes
SHA-256: `3b6037df7a51a5031e26b6529cc8a40877fb57e190d058d705f4f9f75511904c`
`font_02_sfnt_off0000f330.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF330	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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