PDF malware analysis — malicious · 575620e9683fe7bf

MALICIOUS

PDF

84.2 KB Created: 2021-07-14 02:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 249725c4645d3aa7099a37d62872c189 SHA-1: 1a46af0b828420e04f91a38b09493c808dbb81dc SHA-256: 575620e9683fe7bf1b2689cd04581f9605c937c12fa4297076147a22db9db3dc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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://crewmak.ru/uplcv?utm_term=identical+meaning+in+english PDF link annotation
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609102e8f339f---69972135680.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d458cec78---24705229166.pdfIn PDF document text
- http://tantusmarina.com/UserFiles/file/makerukekejatuguk.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/oeq32q40v8lm4420gjpffhd6u8/zunigisata.pdfIn PDF document text
- https://linker.tw/files/22790720487.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608444cc08508---wibudijizek.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607798ad07cdf---41794417498.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431f256b2f---dapaluximezed.pdfIn PDF document text
- http://sport-way.ru/img/file/zawupakarerulasuganixiga.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4eca97b2---10924799578.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/t8rcoutj0eq5cttek8neooh9fq/juritolin.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857a02a5e3d---gerul.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6931081610---vapoxovijilutan.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609811bc08995---dulujusovavani.pdfIn PDF document text
- https://bioesteticaonline.it/file/10681302208.pdfIn PDF document text
- https://kaplaitalia.it/userfiles/files/93766622672.pdfIn PDF document text
- http://ilturismoinitalia.it/userfiles/files/wiziw.pdfIn PDF document text
- http://abwmarlboropike.com/uploads/files/58487450368.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/52803c44e78f3a0c2104c49e12850127/32560171434.pdfIn PDF document text
- http://bonfiremadigan.com/uploads/fckeditor/file/6625040403.pdfIn PDF document text
- http://agnieszkapawlik.com/userfiles/file/lotuniv.pdfIn PDF document text
- http://eprdel.cz/userfiles/file/50017052128.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824b031f93a---21654821204.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ca8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA8B	17536 bytes
SHA-256: `3f812e143ef69011906e2ec35e1fee4d04d1d1eda0860c00445bf13dff8748fa`
`font_01_sfnt_off0000e453.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE453	10548 bytes
SHA-256: `ca83f517f9fb101cca6e89ecb5d9a68985cb2ddd60b5f32666f9e264c7c2a259`
`font_02_sfnt_off0000fbef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBEF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00011401.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11401	17352 bytes
SHA-256: `12274e59502b58d98d6e43404b657294adaf0a17830b4d0033c471d2fda13067`

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