PDF malware analysis — malicious · 255982f2b9ca78f4

MALICIOUS

PDF

90.1 KB Created: 2021-08-06 16:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: c74078f8ce9bdc1327f098ce57ed6939 SHA-1: 2421fb9ff887f803d7795a9a149654119793591e SHA-256: 255982f2b9ca78f4d3c223e5b483fe48d9f40101f17184102845c025b8b1fbbd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary function seems to be acting as a link farm, potentially to distribute further malicious content or engage in SEO abuse. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malicious redirection attempt.

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://huntic.ru/uplcv?utm_term=how+to+express+feelings+of+love+to+boyfriend PDF link annotation
- http://cuatro-pr.org/sites/default/files/file/25289517688.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/kadidojadolaga.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a79da783226---gebijalipowexe.pdfIn PDF document text
- http://youngshiny.com/userfiles/file/1624080037.pdfIn PDF document text
- http://sbsinternationalschool.org/sbsisnew/userfiles/file/33321349566.pdfIn PDF document text
- http://abwsalisbury.com/uploads/files/mikulukum.pdfIn PDF document text
- https://nakatarikaszel.pl/app/webroot/userfiles/file/jazibefumolanerox.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/70c1793d7c893e762a33f11d4a49b626/dukadojinex.pdfIn PDF document text
- https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/8645skdtrtf1ej1es2mjq7o8um/17573887617.pdfIn PDF document text
- https://bisnismedsos.com/userfiles/file/69761537313.pdfIn PDF document text
- https://mut-zur-veraenderung-hambuch.de/userfiles/file/38636024467.pdfIn PDF document text
- http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca37a3325e---lulewopalumig.pdfIn PDF document text
- https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/vutawoxesaze.pdfIn PDF document text
- http://imhome-listings.com/userfiles/files/nanekadafapad.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7882d2e3a43c31c031ffaf5324d3deff/militewor.pdfIn PDF document text
- http://guyfamilyreunion.com/clients/41950/File/biwepufova.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3bb65a4d7258d04caee92192ff2df22f/53219491364.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c986ecd5422---56147582245.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c67cb348d---fanezugi.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b7454014f0f---mojuzokujokunogazimizup.pdfIn PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/df645cd704e26c074ee571b52b43f29a/mavojaxebujepun.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6281bda0b02221f06be3648ec059507f/mejewutubogunologij.pdfIn PDF document text
- https://sona3elkhair.com/userfiles/file/nesirimubowidukaj.pdfIn PDF document text
- http://eltonltd.ru/sites/default/files/uploads/89810432859.pdfIn PDF document text
- http://ducnhua.com/upload/files/tuselewakabosumuzetafo.pdfIn PDF document text
- https://fereshtegan.net/basefile/fereshtegannet/files/sulikopulikusivonowupo.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160974662df8a8---biferitegusexelowinuj.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_off0000fc59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC59	16824 bytes
SHA-256: `47f05ee96af66a38e8be39727f3ab05071b27ae9ba803c63e477116c747021ac`
`font_01_sfnt_off00012812.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12812	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014029.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14029	11012 bytes
SHA-256: `12bfe38dddf5386a17669ac30bba0111407a5040542d850f6c32c9be4bec2f16`

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