PDF malware analysis — malicious · 1493bfa5f35301e2

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 21:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 66077643ee97638ebe64e892f91eac8c SHA-1: 516aabf9d84cad8757a3b7195cfcfb735d17f24c SHA-256: 1493bfa5f35301e298ddb5b5ded56388336979fb1dd64be0ab1761da13cbd33a

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 as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution point for phishing or malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/oqilrhjaioul78nbi1dmjd32v0/gotos.pdf In PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160783f07d7f74---govibiworabox.pdfIn PDF document text
- http://lyzjkgm.com/d/files/biguradoverilosipazoj.pdfIn PDF document text
- http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16208634602592.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b86d24f05---75230838643.pdfIn PDF document text
- https://acronimocostanzo.com/userfiles/file/12472934242.pdfIn PDF document text
- https://dukeofmarshall.com/ckfinder/userfiles/files/dekuwunokudor.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fc2b34dd---1534915613.pdfIn PDF document text
- https://cebrigantina.com/025-CEB/images-editor/file/tisupoxeki.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160816d1305a23---30496016464.pdfIn PDF document text
- https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f65ecd5eaebf1e15f88be67755ce7856/82598735649.pdfIn PDF document text
- https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/f9n7j1p959kt14dcnj5isblihd/26186035117.pdfIn PDF document text
- http://nhadep30giay.com/uploads/image/files/39129642732.pdfIn PDF document text
- https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d430308aeb5fffedc9fc510d27d06b45/59021179952.pdfIn PDF document text
- http://bhhangkhong.com/upload/images/files/jafovawum.pdfIn PDF document text
- http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/81141028911.pdfIn PDF document text
- http://allasclub.com/campannas/file/70693490887.pdfIn PDF document text
- http://akinmedical.com/uploads/file/30589099829.pdfIn PDF document text
- http://connect-event.fr/ckfinder/userfiles/files/genusajug.pdfIn PDF document text
- http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/3793171262.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2163329d9---zibobimanonimosoduka.pdfIn PDF document text
- https://www.hippocratio.gr/ckfinder/userfiles/files/bavodabokidumap.pdfIn PDF document text
- http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/53239733652.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0b6e6e3d48f4563d907368d46dc45b53/jimetekudu.pdfIn PDF document text
- http://donghobaoan.com/uploads/files/movigapunizadinapug.pdfIn PDF document text
- https://serini-cloud.pl/uploads/editor/file/kusoxisisino.pdfIn PDF document text
- http://beautifulmoda.com/userfiles/files/89885936160.pdfIn PDF document text
- http://jatyn.cn/upfiles/202105/file/1620963535.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=export+pdf+with+transparent+background+indesignPDF 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_off0000d6dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6DD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eef4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEF4	11356 bytes
SHA-256: `c4b96f69280215975a2437bc8da1e80a09b02007314a5ce1f1349e4147541e94`
`font_02_sfnt_off0001094d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1094D	17756 bytes
SHA-256: `22966eb5095e6df920b84ef412b841089447daf92f61650bc04a0f6648d1b030`

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