PDF malware analysis — malicious · 7ef84a5986529b1b

MALICIOUS

PDF

101.5 KB Created: 2021-09-02 19:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 5c69e596dc4359641fb1068cdc7ecf7c SHA-1: e3af82e81158fa0769b20ac643b65fe8f9ca5e3d SHA-256: 7ef84a5986529b1be3a9a4fe9dba96b26de2a23a442703e9d65518ac5765622c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a link farm with numerous external URIs, many pointing to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis suggest the primary function is to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9877

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://crewmak.ru/uplcv?utm_term=appareillage+electrique+cours+pdf PDF link annotation
- http://electrogalicia.com/electrogalicia/recursos/archivos/datuvasudekexubagejo.pdfIn PDF document text
- https://mgrenginiai.lt/ckfinder/userfiles/files/vuxexuvunuvavivunuribiz.pdfIn PDF document text
- https://aadhaarretail.com/administrator/imagetemp/file/9145478828.pdfIn PDF document text
- https://juhaszautovill.hu/userfiles/file/12962314151.pdfIn PDF document text
- http://anshan56.cn/userfiles/file/16260995471839942587.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4mgo154amtekk2crvsno2arbl2/20949271884.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f6bc7d94---xopofipuvutimevuxefirula.pdfIn PDF document text
- http://qtjdb.com/UploadFile/2021/06/26/file/20210626_224433_139.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5amqirfdpbr91p2nlu9rc8t0jm/5217821581.pdfIn PDF document text
- http://lncxjzxxw.com/upload_fck/file/2021-8-10/20210810085341770364.pdfIn PDF document text
- http://thuexe7cho.vn/upload/files/95790022414.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec993453624---12386183512.pdfIn PDF document text
- https://livredart.com/ckfinder/userfiles/files/xanelajikojovenimo.pdfIn PDF document text
- https://sacc-la-chaux-de-fonds.ch/fichiers/file/1676808037.pdfIn PDF document text
- https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c0ee5f27aec9b0b69d5208ae7495bbaa/wipapafekusefamub.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/85896eac4916e16b8e4a2dbafc0d4abc/3715376845.pdfIn PDF document text
- https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0fc6cad4492508f3b3068144881b0fde/pelumulanaxa.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v90osboosho6vhfifrn5sfm897/84710107836.pdfIn PDF document text
- https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/a36c26ea93d7db07b320263675a55de3/vilarazo.pdfIn PDF document text
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/63397002980.pdfIn PDF document text
- http://vom-ragnaroek.de/uploads/file/fasefevositiku.pdfIn PDF document text
- https://solucionaesp.com/ckfinder/userfiles/files/61825327953.pdfIn PDF document text
- http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/dubarenidebajokewaxajisiz.pdfIn PDF document text
- https://celebicatering.com/upload/ckfinder/files/vedibijotaxabadedi.pdfIn PDF document text
- http://scard.vn/app/webroot/uploads/files/wumara.pdfIn PDF document text
- http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/dorewerafeganomor.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_off00011db8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DB8	10920 bytes
SHA-256: `8a566955636d771d21402710f4be4ad7675dee33d9828b9ca367b93e2904c851`
`font_01_sfnt_off000136a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014ebb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14EBB	23220 bytes
SHA-256: `7f5b7c27e49fde77e9355aeef3ae1a96de122273bf671cc455a637c86967eb6f`

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