PDF malware analysis — malicious · c208b3071d4a8cce

MALICIOUS

PDF

92.9 KB Created: 2021-10-13 01:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 394a26210228acc48c5d67eec4a6ebde SHA-1: f45d282003d21a71247f92d9d353566a57db889c SHA-256: c208b3071d4a8cce19fb6bfd489296c16b9917e631223b72f22fbcc056e97285

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document likely contains numerous links pointing to disposable domains, a common tactic for phishing or malware distribution. The embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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
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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f80b9de85---40746917204.pdf In PDF document text
- http://www.s-prom.si/fileupload/file/77447434249.pdfIn PDF document text
- https://varbackaforskola.se/ckfinder/userfiles/files/besokokirijidoluwuxekeze.pdfIn PDF document text
- http://rayocazar.com/images/elfinder-1.1/files/file/45341073817.pdfIn PDF document text
- http://macautemple.com/userfiles/file/pixirametozumilog.pdfIn PDF document text
- https://coffotea.com/uploads/files/202109110150127815.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159b1d8da22b---20472899360.pdfIn PDF document text
- http://flashdisplay.net/UploadFiles/FCKeditor/20211010224322.pdfIn PDF document text
- https://hagabb.ro/ckfinder/userfiles/files/39432457114.pdfIn PDF document text
- https://goldgreiner.de/userfiles/file/libalufubokizu.pdfIn PDF document text
- http://paulgraphics.paulsfashion.in/files/71467636858.pdfIn PDF document text
- http://randoquad72.fr/userfiles/file/degududixejizadusi.pdfIn PDF document text
- http://sanitaerprofi.ch/fckeditor/editor/images/file/gakiliji.pdfIn PDF document text
- https://gabinetpro.pl/kosmetyczka/krakow/files/xizitinaxizeniwefi.pdfIn PDF document text
- http://abwgulfport.com/uploads/files/dizaluwudabokidaxusarop.pdfIn PDF document text
- http://wcsps.com.tw/ckfinder/userfiles/files/90091667530.pdfIn PDF document text
- https://dlt-nkp.com/fileupload/file/27767414519.pdfIn PDF document text
- https://egokituz.org/files/galeria/files/wojolarugabiwumimerodeweg.pdfIn PDF document text
- http://drivescuolaguida.it/userfiles/files/fexaramafupud.pdfIn PDF document text
- http://meteosputnik.ru/userfiles/file/kefisonulixipusede.pdfIn PDF document text
- http://apluskleaning.com/admin/images/file/gedexepemasaxifilo.pdfIn PDF document text
- http://idolyokocho.com/js/ckfinder/userfiles/files/34998312220.pdfIn PDF document text
- http://feedproxy.google.com/~r/MbOu/~3/tgwjJlsMqHc/uplcv?utm_term=bilingual+education+in+the+philippines+pdfPDF 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_off00010126.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10126	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011938.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11938	19448 bytes
SHA-256: `745be72b0d15e30caf8d97eaf5157d0d978f26b5a5bca0684ef28902f7ca5cb6`
`font_02_sfnt_off00014c76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C76	10952 bytes
SHA-256: `c23d9500b8779b509e923e77880c4aa82078ae3cdcee9f0f931877aad370dfd5`

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