PDF malware analysis — malicious · ce30770819bdfed9

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 12:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4ae8687e6443757d8296ed946d7c9779 SHA-1: d0cdc7dea97233246c342a460fc4dba3d29e9f07 SHA-256: ce30770819bdfed9ad0fe0300787dbf953ba6607017e87458f1e467e0166bcc4

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or deliver a secondary payload via the embedded JavaScript and external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://synerhu.ru/uplcv?utm_term=hsc+calculus+book+pdf PDF link annotation
- https://zhavezbozi.cz/data/file/63075738617.pdfIn PDF document text
- http://pillshop.ru/uimg/files/9357891879.pdfIn PDF document text
- https://egyediajandekotletek.hu/mvc/userfiles/file/63446673209.pdfIn PDF document text
- https://pixel.bg/img/file/telajitefofuvawid.pdfIn PDF document text
- http://cowmoo.org/ckfinder/userfiles/files/volekudasijakaxol.pdfIn PDF document text
- https://qualityroofinnandsuites.com/nbloom/fckuploads/file/kopojumobopasunemudumimu.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4826ce90---tiwujurakazuzorobeki.pdfIn PDF document text
- http://changrung.com/ckfinder/userfiles/files/rujuxagipopogevudu.pdfIn PDF document text
- http://fusiongrup.ro/userfiles/file/sanazexusegez.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613156d575cba---jumuwetafanile.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05a77564f---76559066478.pdfIn PDF document text
- http://ambulatorioveterinariomariani.it/userfiles/files/1045715219.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb411b466---37527033184.pdfIn PDF document text
- https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/14372473742.pdfIn PDF document text
- http://mongolia-volkslift.com/uploads/files/40722189012.pdfIn PDF document text
- https://panegovernance.com/ourprojects/chowki/UserFiles/file/66083729323.pdfIn PDF document text
- http://thefencedocumentary.ca/adminfiles/file/ludek.pdfIn PDF document text
- https://autohausnschmidt.de/userfiles/file/tivovinevuxesolasu.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161343373adc73---widunubitegoxegaxamibapas.pdfIn PDF document text
- http://tjchenxing.com/filespath/files/20210903224815.pdfIn PDF document text
- http://materialdeestudo.top/userfiles/files/97155837839.pdfIn PDF document text
- https://spitalmoldovanoua.ro/ckfinder/userfiles/files/2817848681.pdfIn PDF document text
- http://maezawa-jidousha.com/js/upload/files/59947940865.pdfIn PDF document text
- https://ocw.tw/uploads/files/nobukofobabupit.pdfIn PDF document text
- http://marasintl.com/public/ckfinderuploads/files/29358516063.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_off0000bb33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB33	10412 bytes
SHA-256: `3dea78cba0fc80bf31f4411e707142a3674eeceb1950e6e9d8c5d3f1b6163891`
`font_01_sfnt_off0000d2ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eabf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEABF	17252 bytes
SHA-256: `b61be9556d6ccaa32f5adad98d8fc51a3bcf4b4be13ae440f8089c3e1c276dc2`

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