PDF malware analysis — malicious · 59554c040516b1ff

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 04:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: f4bd076ebd00ad2b7e0e34fa444a6680 SHA-1: 43aca1bac0f0878979455c638a6746d791a6b518 SHA-256: 59554c040516b1ffa4fafcf041e87388e78dbafc8a571227815f46b7a9ba7d1a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9904

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://synerhu.ru/uplcv?utm_term=corrientes+filosoficas+contemporaneas+pdf PDF link annotation
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/525lfeplfaipha7cj58cs1pl85/64754773464.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c692020a87d---jimoxiximukolir.pdfIn PDF document text
- http://restorationteleconference.com/clients/73716/File/33987063557.pdfIn PDF document text
- http://didula.com/img/file/96603411015.pdfIn PDF document text
- https://guijek.com/userfiles/file/nitamafamedovemed.pdfIn PDF document text
- http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/78295312319.pdfIn PDF document text
- https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586352b0a0---64803620683.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3971d4d2---61181763005.pdfIn PDF document text
- https://lanna-flyingclub.com/ckfinder/userfiles/files/50389360156.pdfIn PDF document text
- http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/6084640433.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161089bdd00817---87594679669.pdfIn PDF document text
- https://stbenedikt.ch/userfiles/files/vagogagawemopew.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607198ad6aad1---91617475222.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/15e9faf7d4e201d1dededaa692260e4b/gupusitojafivolojige.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/442b1f722faeee8763e9f85efac13a49/jujozonogon.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a91c5513b---9171191790.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f202c26e14---kokobiwebexonofa.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/34749f347e8902f84c25810fb9d781ea/nuwavunabedusigitupofo.pdfIn PDF document text
- http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21051009585135268210d7u9.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6650373d---71248792196.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/da533417db449ef4b3490a596ec4527e/fipelobedarulomazavanexe.pdfIn PDF document text
- http://centreforeffectivecoaching.com/media/file/jifilajo.pdfIn PDF document text
- http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/janenazomejubobefokilo.pdfIn PDF document text
- http://decaldankinh.net/upload/files/rewojowuzizo.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160739e66d75aa---16857958690.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_off0000b650.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB650	10812 bytes
SHA-256: `57d42ae9e22f98fb99d2facb11afebee0a4080479a8721520dcd7efdb306c433`
`font_01_sfnt_off0000cf45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF45	14840 bytes
SHA-256: `8e53bee8349bda524733fae642e64595d2e9a76a71deb85324db897730d5c62f`
`font_02_sfnt_off0000f410.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF410	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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