PDF malware analysis — malicious · b55184eff179764d

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 16:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 7b734d370d66c862e8f312f58f4f0bc6 SHA-1: 95efea78cc9d657e8943f688b02bc143019ba553 SHA-256: b55184eff179764db4da2ff9ae90d1ad8135eebe11b6e4d0eca3c7a8bd16299d

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 websites 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 likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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
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://bestcaps99.com/ckfinder/userfiles/files/43537253854.pdf In PDF document text
- https://martas.vodrsport.cz/uploads/files/kosenad.pdfIn PDF document text
- https://blnk.eu/userfiles/files/70033499145.pdfIn PDF document text
- https://assisdrive.pt/userfiles/file/52040494229.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6852a771---88525837499.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/08f5krk7bf99ktgkhbtao6ptki/korapisodeduwukapa.pdfIn PDF document text
- http://gelikonline.ru/content/Files/xudafagota.pdfIn PDF document text
- http://anchor-m.com/js/upload/files/jukokininibibi.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354544a77f2---galuwutumuzidaso.pdfIn PDF document text
- https://larioenergy.net/uploads/file/49503651537.pdfIn PDF document text
- http://sanjarbek.uz/userfiles/file/sakudimomedo.pdfIn PDF document text
- http://locthanhroyal.com/upload/files/sibaletukusefuxaterires.pdfIn PDF document text
- http://astorandblack.net/emailer/userfiles/file/67467066647.pdfIn PDF document text
- https://soi.icami.mx/ckfinder/userfiles/files/63068968233.pdfIn PDF document text
- https://giridhareye.org/ckfinder/userfiles/files/7644071132.pdfIn PDF document text
- http://bushurov.ru/images/files/xezizokapuxemavula.pdfIn PDF document text
- http://shippingengineering.com/files/ckeditorothers/94275231191.pdfIn PDF document text
- http://dsraxys.com/uploads/gajapad.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407d19b0d76---8966317446.pdfIn PDF document text
- https://clinicamanila.com/ckfinder/userfiles/files/roxesokujafozonaze.pdfIn PDF document text
- https://loyalangkorapartment.com/userfiles/file/zomasuzuzotivepem.pdfIn PDF document text
- https://suativisamsungtaihanoi.net/upload/files/nedevapupipogupuxezitawuv.pdfIn PDF document text
- http://vuatoyen.com/uploads/userfiles/file/98734983936.pdfIn PDF document text
- http://litroshaber.net/resimler/files/22653989942.pdfIn PDF document text
- http://the100voicesofgospel.ch/fichiers/newsletter/file/rorupikobefafije.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=syeka+gaming+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_off0000b31a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB31A	10592 bytes
SHA-256: `641b8292d42cbadc86037b41cdce7649fc2b6499b5f11970a325661194659854`
`font_01_sfnt_off0000cb1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB1A	18208 bytes
SHA-256: `e0914a463ba24640d945380ecb99d3458b8f76bac73c5243cbbe445de292ab22`
`font_02_sfnt_off0000fa0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA0D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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