PDF malware analysis — malicious · 4aa48d69f3ccdc8f

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 03:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f27af078c226f528e6ce0f636ffedb3e SHA-1: e5e88ecee7f23b6a0160e3669c4796ebf1a669b9 SHA-256: 4aa48d69f3ccdc8f3d6cd408bdf8040907cfd0a1a6cdb46f79231d47a137b6a5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

Heuristics 7

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.
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 http://fanta-life.com/userfiles/file/vumilinoxi.pdf In PDF document text
- https://artasedanasingaraja.com/uploadfck/file/60524954337.pdfIn PDF document text
- http://ppogrimall.com/upload/editor_image/file/burasisesediwefuwigemupig.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/db69i7quqgps3pd30oujq1n1k2/pikamaxesazugexipojev.pdfIn PDF document text
- http://ballarioarchitetti.eu/userfiles/files/25429860316.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4ds7950sp5ulp6sl8mkm6009l5/gupesegewig.pdfIn PDF document text
- https://lncl.org/ckfinder/userfiles/files/23693605303.pdfIn PDF document text
- http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16ccdc061---sazexux.pdfIn PDF document text
- https://eqonetech.com/upload/userfiles/files/tuzajogopasupaw.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcbfed26bb---88967304693.pdfIn PDF document text
- http://dansecyr.ca/pdf/file/60107275389.pdfIn PDF document text
- http://mazurubezpieczenia.pl/zdjecia/fck/file/88528913100.pdfIn PDF document text
- http://bienchidan.org/uploads/files/sexugamidatujojeribuna.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3628d7b47b97c121c56af4bb22750a2f/libomabunedesobojilos.pdfIn PDF document text
- https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/53477703367.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b10743e7c---99519251223.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e593ede8280856147ea38c5cdf1b54d5/23240202268.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0f6ddc2f6---91405422996.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1f9e81b61bbd1c40363c1709c93982a8/wopimukupevuwexo.pdfIn PDF document text
- http://chinhsuasolieu.com/media/files/zugezukudezojumowalegud.pdfIn PDF document text
- http://vorne-sitzen.eu/pcms/content/file/zidarupisexovikexete.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b321bb88f2d---2409546172.pdfIn PDF document text
- https://desense.eu/uploads/wysiwyg/files/16037191392.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946ed650808---wajifapudukasetekelos.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609064764b49f---39594085775.pdfIn PDF document text
- https://vgi-vn.vn/app/webroot/img/files/jamup.pdfIn PDF document text
- http://fusiongrup.ro/userfiles/file/45952100506.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=statewide+student+identification+numberPDF 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_off0000c261.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC261	15356 bytes
SHA-256: `8d71733d7b1bfec0ac3ceb0ae5ed9c2eb30e3855f7320fdfc10c7013ac310bb7`
`font_01_sfnt_off0000e931.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE931	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010148.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10148	10992 bytes
SHA-256: `95952aff82b3b56eda86990267b9b78216e67df901455b432abf484881acf3bb`

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