PDF malware analysis — malicious · 4f64d7b56f86f2c1

MALICIOUS

PDF

82.9 KB Created: 2021-07-05 16:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: baa90ebbde1193b938686e3665c1272f SHA-1: f54adc16fdd08f665aa68dd4f8aa2ea1dfe07518 SHA-256: 4f64d7b56f86f2c1998b70cbd950f6b4e29a9242603a457059e682b886d2f111

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=common+property+resources+definition PDF link annotation
- https://abugfreemind.com/userfiles/file/kuliseluwisowi.pdfIn PDF document text
- https://briljant-maleri.se/UserFiles/files/95452231948.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/8beae47315d7052b35d602735658d481/27030302521.pdfIn PDF document text
- http://www.dilipprabhavalkar.com/images/file/89666726816.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7db666213---85953213596.pdfIn PDF document text
- http://greenbrier101.com/userimages/waxupogezuso.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e443d0a21e871694fcf84adc398da3dd/54699224650.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d3afbe0d7c6---wodavumal.pdfIn PDF document text
- http://automotiveenergy.cz/userfiles/file/limaburojekupawugizunur.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4041176fad---93170391411.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/dca6af8d86b811a20cf4e992d5bfeaed/pepokovesidizudirebufojod.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5c02b5cbd9423bc9beb087e6fd1fa14c/43206347250.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/eqq7e99n6v955epdsdo8k20103/suvamitobiwedevaforuzof.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160931e04b9285---wibumuzanajepirux.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/20743738a4d2be544a92e62695c8f0ee/kibom.pdfIn PDF document text
- http://ncabhsa.com/clients/875427/File/61486536083.pdfIn PDF document text
- http://daindnc.com/fckeditor/userfiles/file/81274952275.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gujugoxi.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/078fbf148d0c3e8ad681d7a090d38096/revijapimifipupoguw.pdfIn PDF document text
- http://sieuthivatlieuhoanthien.com/upload/files/72135092476.pdfIn PDF document text
- https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/j0ksra6a7ba8qak1e2uh221n61/41985733784.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7694e9af---kavabukemixaxi.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ccc89cf0---689625423.pdfIn PDF document text
- http://www.asslar.de/downloads/fokakisibekapegigel.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_off0000e19e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE19E	10816 bytes
SHA-256: `ff7187662d705ab11b9c0311509c90f725406b4a0c696f0372963796d814cf01`
`font_01_sfnt_off0000fa92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA92	16960 bytes
SHA-256: `a8671e78740b29d4e0570def0163f16fab34ed20488bc2fd56e9b0c80e994949`
`font_02_sfnt_off00012642.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12642	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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