PDF malware analysis — malicious · 9096ce55f6a8900d

MALICIOUS

PDF

89.9 KB Created: 2021-08-02 21:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f3832c610e46da733667ddeb4b7bff01 SHA-1: 42f6767fcd26ccac0930080e08f72ab700ca0844 SHA-256: 9096ce55f6a8900d418e89616637272bcd7da78b550708b76a6907579e8bf2d8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable domains, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple links on potentially compromised or disposable hosting reinforces the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

Heuristics 6

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.
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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/fke8ftkgbl99e334lgqilaitjr/wirivadikasezoxix.pdf In PDF document text
- http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/vojoxib.pdfIn PDF document text
- https://dienlanhbachkhoa.info/upload/files/nakokerupejuzewokutukobuf.pdfIn PDF document text
- https://atlastoursntravels.com/userfiles/file/sepifilinopepitokidotowad.pdfIn PDF document text
- https://grandplaza.bg/uploads/assets/file/lufuf.pdfIn PDF document text
- http://prime-standard.com/piceditor/file/kelewosijizivazo.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/icfis1f1c7qnfsr4i8v6gvgaug/bunogufutelukenajif.pdfIn PDF document text
- http://erdivigado.hu/userkepek/file/kurawalirajev.pdfIn PDF document text
- http://sacoorhealth.pt/site/upload/file/9106390501.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/bubonabu.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c9323f198d43b003c3c115b5136aec0/15539273412.pdfIn PDF document text
- https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/49213899543.pdfIn PDF document text
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bf66c38ca30a6f22c04ec74748dcc380/96661259332.pdfIn PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f9c4878bcf192e32e11a808e1033a9f2/mejuxovurapanerunava.pdfIn PDF document text
- http://hagelkonzept.de/userfiles/file/54494030423.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6beec9829c---retozofibabe.pdfIn PDF document text
- https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vigajanexatewiko.pdfIn PDF document text
- http://avsa.org/sites/default/files/images/files/rijivumopo.pdfIn PDF document text
- http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/tq8t5hgoe4ps5qhgf60mjabit7/87171778280.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608661440b2ce---12953455952.pdfIn PDF document text
- http://tiramisu-o.com/yamituki-n/uploads/files/zidubexekiba.pdfIn PDF document text
- http://mtcongnghiepxanh.com/upload/fckimagesfile/37851379839.pdfIn PDF document text
- https://dansobentre.net/uploads/file/2566345911.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ivbh1tdgfl33pl9btvqh7q4hf1/35603976177.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8937c8a559ad1687e8ede50503696cbb/miwulimego.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e027429371---janesifanomu.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/441b780b9dd058e1e4eea91273a1ab44/95007257195.pdfIn PDF document text
- http://atya.eu/files/file/dabopijigevojuzagiji.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=imagenes+de+los+reyes+magos+para+imprimirPDF 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_off0000f68b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF68B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010ea2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EA2	10704 bytes
SHA-256: `f8249c1a7fb9933033dfa35b9858a9be4862c0c84a9b7483bfd18d1e2acba636`
`font_02_sfnt_off000126e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126E4	18764 bytes
SHA-256: `1c194ce604e9d2d4685bdd93f4d97833cebe739d7b4d68c3de4cae307d5fcb1b`

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