PDF malware analysis — malicious · 70f0365c03e2f12b

MALICIOUS

PDF

77.4 KB Created: 2021-10-01 08:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 14c7dd4919b75e7210dcf597ed795a8e SHA-1: 1fe707a483788ee27956f33560e3a087fd00c477 SHA-256: 70f0365c03e2f12b7b04cf36db82071a6e1223d6b61fb6bafdbe2d2149c5def6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of link farming on potentially untrustworthy domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://cructi.ru/uplcv?utm_term=diferencias+y+semejanzas+entre+desarrollo+sostenible+y+sustentable+pdf PDF link annotation
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1615288fd96974---bimaj.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16145dfc98b004---42575895722.pdfIn PDF document text
- https://www.ccs-corporation.com/ckfinder/userfiles/files/wewuvosowulodetibebulaxo.pdfIn PDF document text
- http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85095245330.pdfIn PDF document text
- http://atomicattack.com/atomic/fckimages/file/raxudabugiso.pdfIn PDF document text
- http://clinicaveterinariabilancino.it/userfiles/files/fanuba.pdfIn PDF document text
- http://moriefrusca.com/userfiles/files/54382210339.pdfIn PDF document text
- https://stpm-sa.com/userfiles/file/pepavejujijenewamuji.pdfIn PDF document text
- http://camara.acessoainformacao.org/uploads/ckfinder/files/nobokukebamuxoxezetuzuviz.pdfIn PDF document text
- http://autowassenindex.nl/images/uploads/93827450528.pdfIn PDF document text
- http://missteenqueenuk.com/userfiles/file/31959372933.pdfIn PDF document text
- https://vishalahospitality.com/ckfinder/userfiles/files/55552685233.pdfIn PDF document text
- http://dirpub.org/editor/ckfinder/userfiles/files/92289083167.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614233323d12a---rirodakabimoxutos.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615087d4903d9---7704910608.pdfIn PDF document text
- https://durimawar.com/contents/files/tifuwasesuka.pdfIn PDF document text
- https://szelvedojavitasmiskolc.hu/files/files/80385766621.pdfIn PDF document text
- http://facilitymanagementassociates.com/survey/userfiles/files/lofuf.pdfIn PDF document text
- https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/lomakaj.pdfIn PDF document text
- http://verynailscm.com/user_img/file/livugu.pdfIn PDF document text
- http://montaze.org/democms/userfiles/file/jixafagekojupotoxusoz.pdfIn PDF document text
- http://armanetti.com/images/vabevijotofasulibativoda.pdfIn PDF document text
- https://manuscripthandler.com/userfiles/file/84841849485.pdfIn PDF document text
- http://volkshilfe-vlbg.at/images/content/files/67924084977.pdfIn PDF document text
- https://mudraconsultancy.com/uploads/files/33032264818.pdfIn PDF document text
- http://ecohost.ru/pics/images/file/38048249447.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_off0000c479.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC479	18220 bytes
SHA-256: `61d2920c189045ac998c7fcbe7f7f7e8e5fa96c22b87747b9e69f8abb1845784`
`font_01_sfnt_off0000f439.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF439	11328 bytes
SHA-256: `ebe5950e25b5d6469eaecacb41dc5b71d1a2962b56e0da56f18a67dd29038860`
`font_02_sfnt_off00010eb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EB0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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