PDF malware analysis — malicious · d36bd4b820239876

MALICIOUS

PDF

89.6 KB Created: 2021-07-13 16:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 6893d23664b385634a58ea81e292ce69 SHA-1: fa7cf0dbf9f3b87a8077af7c5d1901d66dcda819 SHA-256: d36bd4b8202398769a74c29d2a650ea13718aecb9dd0f854a0e87c16208c2e88

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various compromised websites and disposable hosting, likely to facilitate phishing or malware distribution. The presence of embedded URLs and the 'SE_ENABLE_LURE' heuristic suggest an attempt to trick the user into interacting with the document to initiate a download or redirect.

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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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://infrive.ru/uplcv?utm_term=different+types+of+computer+viruses+pdf PDF link annotation
- http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/48047540586.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f86cc33ea72d49374979df382e853128/27403883020.pdfIn PDF document text
- https://airshow-bg.com/file/6350581101.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160766690eed77---kokagukerek.pdfIn PDF document text
- https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0c60690f4757083286dc9d9c46ea8371/87655848484.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160727fdceca60---95445531140.pdfIn PDF document text
- https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/8f95248fc2c7ff527b0e4f4dc32e5866/sipejati.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090707b5afe2---91277700180.pdfIn PDF document text
- https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/7b8ad7fb88c96deaaf30f635f57e039a/6834411172.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/27a3c4a8f46997c9ea7ed9a82cb44ee9/vozijosuzuvebo.pdfIn PDF document text
- http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvopumem.pdfIn PDF document text
- https://thuaphatlaihoanghuy.com/uploads/files/46637700600.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f4b943e1e1b4dfdf1669f1ab89b56f51/xudujawuz.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098d616e33dd---27332615627.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a6656422c---92160292420.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e89a4d1b---milewedamimegilitebi.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4594d49be7---gapigowozotazojiziju.pdfIn PDF document text
- http://buffagiuseppeinfissi.com/userfiles/files/23199443376.pdfIn PDF document text
- http://simonide.org/userfiles/file/wodulizoximirarame.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b5db44f5---9050302275.pdfIn PDF document text
- http://szpital-sulecin.pl/images/fckfiles/file/zomet.pdfIn PDF document text
- http://skogsformedling.se/bilder_umeny/File/62960961080.pdfIn PDF document text
- http://cec-intl.ru/app/webroot/files/file/10688248471.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/590113b23d2c9eb7c27df7499e6561cc/gatex.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_off0000fc75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC75	10856 bytes
SHA-256: `ab26452dd2146af2f68395b1e971f6ec816766fc4ca53339dcfae0ba2a466fcb`
`font_01_sfnt_off00011596.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11596	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012da8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DA8	16740 bytes
SHA-256: `ba8bbefedfe0d9525595b77328a8a18990997b5b1b46abab4f0c78ce18877893`

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