MALICIOUS
156
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1059.007 JavaScript
The sample is a PDF file detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm pointing to compromised WordPress sites. The embedded URLs suggest a phishing or malware distribution scheme, likely attempting to trick users into downloading further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating its generation method, and a search term related to chess openings, possibly as a lure.
Machine Learning
- Nyx PDF Classifier malicious score 0.9997
Heuristics 6
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ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARMPDF 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.
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Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARMSmall 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.
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External URI info PDF_URIPDF contains an external URL action
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe 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.
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Embedded URL info EMBEDDED_URLOne 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://chcial.ru/uplcv?utm_term=enciclopedia+de+aperturas+de+ajedrez+pdf+descargar PDF link annotation
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4f14cb99152354b532808bd34f62c5a6/giruzuz.pdfIn PDF document text
- https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/vpp7lobvon63p72br98p4nbg5b/wopupofupomojepegutef.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae212ea4c2---rexukisadakukovenuk.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083369a413d4---ratelidogifesofifibomi.pdfIn PDF document text
- https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/51bd6ba6f2c2904d27a05b4236a3bced/12007681003.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99e305acc9---sawunodutobovuxenizedatuz.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c9972077---seretemoba.pdfIn PDF document text
- http://thaoduocquyhiem.com/userfiles/image/file/tuvewarebizetawab.pdfIn PDF document text
- https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/98b17b56f877762f746ebf43dab565bc/10849373614.pdfIn PDF document text
- https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/7eddaf80d18d342451c978dc00008087/tusoto.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd82d2ee1---ravuzirumoxivo.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5d576d07c---9405817295.pdfIn PDF document text
- http://mygotour.com/FileData/ckfinder/files/20210603_6DED7BDCE78FFEC2.pdfIn PDF document text
- http://xn--k1akb4c.xn--p1ai/userfiles/file/90224605030.pdfIn PDF document text
- https://anfauglir.com/images/file/tefadiburijexexumonis.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/27134e345f6773980fd2699d154b5f97/96853791568.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
font_00_sfnt_off00028fb8.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x28FB8 | 5404 bytes |
SHA-256: fcedab0563a5a393c2a22b7e9ccf82665f987776d66710d944e86f9e67413131 |
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font_01_sfnt_off0002a23d.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x2A23D | 12400 bytes |
SHA-256: 47480ee621fe3692d1acadfd89a6bc39849332803ea2857106a5fb519c5f76bc |
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