PDF malware analysis — malicious · 52c638f1e53c19e5

MALICIOUS

PDF

72.1 KB Created: 2021-07-01 19:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 9b6ad1f49ff69c8415fb6a9f7ea52aa8 SHA-1: 70c4cc62f1077e66265fbc069aedcf301179da64 SHA-256: 52c638f1e53c19e58efaaa6a0d9398fb6da9381aa9403591e2b55729790b65f0

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites. These links likely serve as lures to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.6736

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.
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
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://irlanc.ru/uplcv?utm_term=transverse+section+of+a+dicot+stem PDF link annotation
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f434aee5e1---sujol.pdfIn PDF document text
- http://nbpcpentecostalchurch.com/clients/65183/File/dubokomonuwunidugevib.pdfIn PDF document text
- http://cardealer-space.com/js/upload/files/76705565932.pdfIn PDF document text
- http://poltinka.ru/userfiles/file/56505714243.pdfIn PDF document text
- http://etkindenetim.com/resimler/files/pabaludozuxisomawotuke.pdfIn PDF document text
- http://erdivigado.hu/userkepek/file/suvemizaxusuganiperejam.pdfIn PDF document text
- http://duepassidalcentro.it/userfiles/files/67920666600.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84defe6a2a---2817676764.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f8ce3eb37---fezepamilig.pdfIn PDF document text
- https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/ece1bd9576ab9b9b6ec09be31e2d0c00/79715663340.pdfIn PDF document text
- https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/96gdas7cb2t1qkcgtnrnenllmi/balawokanu.pdfIn PDF document text
- https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607279743f537---jelojumadasufifovo.pdfIn PDF document text
- https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/tg5so51n2v7opnugo1l99fp85u/77131168543.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/14c2af8100dc9454764079aff786485e/27791786393.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7pmoa0asrf872gf5l1jqvrc6v2/55537836096.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/71565349869.pdfIn PDF document text
- http://panziofabian.hu/fck_kepek/22115366498.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f09b190ab---migamalifinigiwuwodexaza.pdfIn PDF document text
- https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/54d0f105edc71752a561fecb29aab0fc/kejosifapixesitujetonok.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076799acc438---lupapilabenewixebosexap.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jiuqvqq6el5gmcbpasbhlnb50i/46150542753.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cf1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF1F	16840 bytes
SHA-256: `ccbda733c0d2776c4edc7bcf28737ccaa02fc189e0eefa1d836d0b27250d547d`
`font_01_sfnt_off0000fb2d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB2D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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