PDF malware analysis — malicious · 4450bd41ff16cb75

MALICIOUS

PDF

82.8 KB Created: 2021-08-20 04:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-07

MD5: e67635de5a0bb2b3ecd9843174b34884 SHA-1: e576715ab400481f8a23bed0f5173c002682cc5f SHA-256: 4450bd41ff16cb75d0d103f6f83eefe34fdce6ff1b51f24e56ff7f078e1aed5b

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and presents a fake CAPTCHA to trick users into executing malicious content, likely leading to the download of a second-stage payload. The presence of numerous external links, many pointing to compromised CMS uploads, suggests a phishing or credential harvesting attempt. ClamAV detection further supports its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

Heuristics 8

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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://3e-machinery.ru/app/webroot/filesfiles/jejowunuz.pdf In PDF document text
- http://agcslohian.com/userfiles/file/lifizexuduzowekoxarud.pdfIn PDF document text
- https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fa51ed394efcfa64235db3ddd075e688/zafurexuga.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096fe0e81cf1---muxozopuwaxipu.pdfIn PDF document text
- https://daulte.ch/ckfinder/userfiles/files/2349707462.pdfIn PDF document text
- https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/694863505a00dabf315260d020b144ad/5638425720.pdfIn PDF document text
- http://all-vehicle.net/js/upload/files/xesonobumanoxagupenebol.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1f7b268ed925be287805fd0bf1813ba3/giwubasefipemamopagaxavam.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49fd4571b4---75224545899.pdfIn PDF document text
- https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/d03d1ae7a14f3cb39814b0d7c417c874/8233942403.pdfIn PDF document text
- http://teacherandtraining.com/coj_u/KK/userfiles/files/wexosoleruj.pdfIn PDF document text
- http://cz-synergy.cz/data/file/96985970792.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f0ac4d7f8dff03627008522ccbc7a4f/fofilizimexigakorixixopum.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee1333227---pakepubibakufawi.pdfIn PDF document text
- http://xn--or3bi2da319p.com/upload/fckeditor/file/3786528690.pdfIn PDF document text
- https://peterdegendt.be/file/50333422793.pdfIn PDF document text
- http://baaningdoi.com/file_media/file_image/file/rizex.pdfIn PDF document text
- http://elcivan.com/admin/UserFiles/file/dufeliwenugidudoxetamar.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33b8b23ed---masivesotezemesujox.pdfIn PDF document text
- http://ballmillfactory.com/d/files/penirusamelowojom.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1ea9ed5598f1d7ba0f054c83359cabe2/mavagojinipixa.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/48d0cd6c83696081ecac1a609447ea32/91567854139.pdfIn PDF document text
- https://costabravas.com/uploads/localidades/files/gejunitogobujipi.pdfIn PDF document text
- http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/26510999303.pdfIn PDF document text
- http://pushgroup.lv/userfiles/files/zapevemufi.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/papqhr75lbtes505132qrpqtq6/fajuwalajimijopanakikefoz.pdfIn PDF document text
- http://brenna-ski.pl/userfiles/file/26505143695.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=phoolon+ka+taron+ka+sabka+kehna+hai+video+song+downloadPDF 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_off0000dbe9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBE9	18008 bytes
SHA-256: `36cf8452adc13d905a90e11583b1689ebbb7511eeae1874d1a03b55a70b0782a`
`font_01_sfnt_off00010b23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B23	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001233a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1233A	10912 bytes
SHA-256: `09911edde20d0e315d958551031f5230d94bfca802eda461ec606bcacdf9357b`

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