PDF malware analysis — malicious · 839ea038c0890123

MALICIOUS

PDF

80.2 KB Created: 2021-06-27 12:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: f98a85f720a7c683c5526482a4f497a3 SHA-1: 8c9fb206cf385d9101796d37da8c55b1d3b0cac9 SHA-256: 839ea038c0890123fa9c4a26314815341adabceae5500eac925cbccbef0a0ba2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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://travelworld.ro/userfiles/file/52894678573.pdf In PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nj7c9ca44nhbskjvcgg40bp0v5/wakugapibaliporipixud.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ade3efa9b---lekesigavesitofo.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/tm4i40434i3goqs4ud5qcq8g9k/lujulomul.pdfIn PDF document text
- https://yingzhaoliuart.com/upload/file/4588419415.pdfIn PDF document text
- http://alexanderjamesbackcatalogue.com/userfiles/file/jeleredejevosokova.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/dfe7f87a8985b24b5b539a8a3011039f/89925714565.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0f077d0c4---tiwadodamomexifeso.pdfIn PDF document text
- https://aedwea.com/upload/foto/rizusi.pdfIn PDF document text
- http://ubest.ru/images/file/76493139729.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c244970824261c60b1e3922021143d75/kimiwarudasatereso.pdfIn PDF document text
- https://areicon.com/images/file/niwaxifajokad.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3df448cc5---20815960359.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/61454a281d0110f94da90cd895ccbf9d/92955641864.pdfIn PDF document text
- https://chief-moving.com/editor_upload/file/50944412941.pdfIn PDF document text
- http://webursitet.org/Files/file/balakom.pdfIn PDF document text
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/34q3pcp2o3m9rp7t58bque3sp2/dedukoxerolavolelawejar.pdfIn PDF document text
- https://mauspro.net/upload/files/46193521239.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36a72fb9---ravirir.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8587e01cbbdc0a5512e403a5c0b3de1d/mevudetimoxagora.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cfd329b4d---zozariza.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079574b53337---6074812603.pdfIn PDF document text
- http://jcon-aps.dk/userfiles/file/59139524874.pdfIn PDF document text
- http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/v46uv1nodjppv38nvhut067ji7/gosezozuxibifewavuzusokef.pdfIn PDF document text
- http://physiotherapy-warwickshire.com/user_file/file/84566389790.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e5527ae04fe4fdf6d06ea972db96a1f8/xamumosibiribubuwevuxofe.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=august+month+in+tamilPDF 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_off0000d872.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD872	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f089.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF089	10404 bytes
SHA-256: `7da873819eb5e69c63d07661d1f47203ffc20b0c804372edebd5b84975e40cf4`
`font_02_sfnt_off000107d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107D9	16788 bytes
SHA-256: `613f9526efdb296ee5ba50a8b8fe8b6dd22b4a978ddb2460591614cbfb664f3e`

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