PDF malware analysis — malicious · 5e22f331b0e588d1

MALICIOUS

PDF

81.0 KB Created: 2021-06-25 23:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 9da473ac47d8bf64251ca4b7f55de146 SHA-1: 58e50f5c868e405c8b75c0595f994fadc0519c28 SHA-256: 5e22f331b0e588d13c75d869bd0bbdcc9a8344df65f380d0cb7b6e615a974f1b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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 http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/3430935572.pdf In PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/n9re296llvp0hgv1rtenb118b9/3759119095.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0ef0adb192c4f799b496ddab63e7c59f/nevemozodojonodoxelevipi.pdfIn PDF document text
- http://www.gesas.it/media/mailinglist/file/25667841938.pdfIn PDF document text
- http://www.sport-konyv.hu/userfiles/file/xojonumafobebebenanutazes.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/279ced279b3bac6f70511d8e8867ca22/59443727629.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/71e3378aa471a4c6684085a6e778cece/tosogerupogexuzovevare.pdfIn PDF document text
- http://irinaburmistrova.ru/files/vopexek.pdfIn PDF document text
- http://eia-edu.com/userfiles/file/pewirixunolesor.pdfIn PDF document text
- https://anthonygillant.com/userfiles/file/zemunisegupiwekut.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/0qvqnnsp83dsoff7eq5v07oip1/59495565906.pdfIn PDF document text
- http://xn--xhq021fvrwdth.com/d/files/muvuru.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/fopabokegudavejop.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a67ea64f---rilaribugimoxevadovifu.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c6e3a6711a859d9b69c020221779427f/26029084256.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c230bb1903b---71244336962.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf99546ce0---jovuzev.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5e904f0deb510654fbd42a1a45d563ea/pekikiwataso.pdfIn PDF document text
- https://baohohoanglong.com/userfiles/file/5277098186.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf5edd5bb---12780482419.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608185bf96915---vukowarowanokur.pdfIn PDF document text
- https://iqmuseum.mn/uploads/files/47001094375.pdfIn PDF document text
- https://hostingalani.com/calisma2/files/uploads/tovosef.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=complete+glock+reference+guide+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_off0000d53f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD53F	10856 bytes
SHA-256: `a493f2e11066770a2fd18d4ca1944a7941ee6c7d88d96c49749b9e9799c29c1a`
`font_01_sfnt_off0000ee15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE15	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010627.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10627	18084 bytes
SHA-256: `39142ea9148b6b95a7ec4463774d8e28577ccfe074df99cc518b4357587c0dc0`

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