PDF malware analysis — malicious · af6187720ee14b64

MALICIOUS

PDF

126.7 KB Created: 2021-09-16 22:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 9017d727eb54e32d14808ba4d9459b06 SHA-1: ad734b1297fc3117d13ff80f6f421a1667c64873 SHA-256: af6187720ee14b64517579e291b851dbbf0178bdefb01a90e8f46452a321fece

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to drive traffic or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://oniceh.ru/uplcv?utm_term=app+android+gratis+oggi PDF link annotation
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161373c0126298---makunidudetupupekezuni.pdfIn PDF document text
- http://kelsenator.com/userimages/57827511673.pdfIn PDF document text
- https://drlanda.hu/user/file/zowefixu.pdfIn PDF document text
- http://jinwoosmc.com/userfiles/file/menexowudolule.pdfIn PDF document text
- http://luxcottage.ru/stroykamen/userfiles/files/medizipu.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385bf864e9b---rafidojuruvanupuwunepap.pdfIn PDF document text
- http://bielle-srl.com/userfiles/files/dulilepabibelajogitaru.pdfIn PDF document text
- http://energy-labels.nl/userfiles/file/2166482001.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bffc82946---30344176215.pdfIn PDF document text
- http://1mosref.ru/ckfinder/userfiles/files/kefagarug.pdfIn PDF document text
- http://retrolondontees.com/userfiles/file/zivivesez.pdfIn PDF document text
- http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/1543835071.pdfIn PDF document text
- http://nanumed.ro/uploads/files/64397900337.pdfIn PDF document text
- https://quangtriasianwindow.com/uploads/image/files/laxaxi.pdfIn PDF document text
- http://worldprint.su/userfiles/file/bijabiv.pdfIn PDF document text
- http://servicedental.it/userfiles/files/wavuwujigiwidovebabi.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136a359a647d---28816140814.pdfIn PDF document text
- https://mimpiindah1.com/contents/files/43884388994.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/93eba9e7fe412a4c35c3d62a17f28fcd/84486336130.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa08f212f9---78394166663.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/9096785027.pdfIn PDF document text
- http://terezszilvia.com/images/uploaded/file/61772466259.pdfIn PDF document text
- http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/36366561159.pdfIn PDF document text
- https://ddmmaze.altruistictech.org/documents/img/upload/files/86808567563.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_off00018a6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18A6F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001a286.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A286	10368 bytes
SHA-256: `1c86afd60bc7e8d8c9ab9f2b8ba44f942645db9fb3e02e198cda34f47001d9d3`
`font_02_sfnt_off0001b9d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B9D0	19008 bytes
SHA-256: `cedb770efb6303809c58972aa93be52af4cc018f17b78b65ae8e850879461f40`

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