PDF malware analysis — malicious · 1534534ab9024568

MALICIOUS

PDF

89.3 KB Created: 2021-07-05 06:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: a1d57039da2a82e9a8842bc2ae0371a3 SHA-1: 961c403a9a6681460a17cac8fa58b1debd2aae11 SHA-256: 1534534ab902456835b089ad3127031ece134bae5e61e8fa7009891db80b62f8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier strongly indicates maliciousness, supported by multiple heuristics identifying the PDF as a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs likely serve as lures to phishing or malware download sites. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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://coretry.ru/uplcv?utm_term=biggest+down+stocks+today PDF link annotation
- https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/67a19646ba48dc13df56e5eab8fee73c/dozawexagemuxosegotiruze.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2f59004246f58ff4af1c8d0c1f88dc88/90199887851.pdfIn PDF document text
- https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/18dcd01ed285e7d42fa16ea1ba190be7/boterepavilapaxovi.pdfIn PDF document text
- https://bdsvieclam.com/upload/files/75864603358.pdfIn PDF document text
- http://jnnycc.org/userfiles/file/wesode.pdfIn PDF document text
- http://aeronautike.com/userfiles/file/kujikowelutu.pdfIn PDF document text
- https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/00bba8f186e73d614008b58d03ec2a6d/54811759918.pdfIn PDF document text
- http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/lulale.pdfIn PDF document text
- http://lysfyyy.com/upload/files/89597444899.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080590f5fd46---68409837544.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4e1ae204---meluretatop.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/wazamujobevuwudatosevugon.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/ejogevaz.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/045c148339149d754d6b051feec85f62/sitapuwedemi.pdfIn PDF document text
- https://rux-thai.com/ckfinder/userfiles/files/jokogigiwobolos.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1838d65cf49dc43cb6c9f97b4e9b7487/pabofamojewegemilujavixu.pdfIn PDF document text
- https://okazionche.com/files/folifoxabakidurigelu.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/52511204680.pdfIn PDF document text
- https://meganimal.pt/site/upload/file/592047164.pdfIn PDF document text
- https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7438a62e4c309cbfa47aa12acf2ec4a0/68602995035.pdfIn PDF document text
- https://cambodiaangkorhomestay.com/userfiles/file/6173168917.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609000f1c2a90---vuvupumefavadovemoxip.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/0743261183.pdfIn PDF document text
- https://aydin-elektrik.com/resimler/files/2030780311.pdfIn PDF document text
- http://capmar.eu/userfiles/file/26973567290.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f95a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF95A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011171.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11171	10744 bytes
SHA-256: `e60bf80f2b82dad4510805d6f85d49007440e031e8144f405b5fcf928720e857`
`font_02_sfnt_off00012a39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A39	17500 bytes
SHA-256: `e6ce84bbfd991492370519fdb5d8ef02b77731751d4652208ccc4cec4e512262`

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