PDF malware analysis — malicious · 3ef4ecace53e4a37

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 08:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: d7a76d21271a40191e19bcf7d451bbf5 SHA-1: 9de688202f794de449e0a58fbfd6a0a7dd13fc6d SHA-256: 3ef4ecace53e4a37b7d836573e35dd43014a7e186cd3a4adafa4671b1e574755

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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.
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://medvor.ru/uplcv?utm_term=kinesthetic+learning+examples PDF link annotation
- http://studiotecnicolari.it/userfiles/files/26391932279.pdfIn PDF document text
- http://sprostredkovanieuverov.sk/res/file/kubuvazivuzufozex.pdfIn PDF document text
- http://yyfxsw.com/upload/files/55833671245.pdfIn PDF document text
- http://bagliodeimille.it/userfiles/files/13796406339.pdfIn PDF document text
- https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/dekoforuzupi.pdfIn PDF document text
- http://plantessentialoil.com/upload/files/48556507516.pdfIn PDF document text
- https://guapa2.com/admin/fck/file/13465742085.pdfIn PDF document text
- http://nenorm.com/files/files/50357540182.pdfIn PDF document text
- http://marymo.ru/uploads/files/fokekikodapugagewegiras.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f0143c43b0c9ed22a5509e257d3442a1/zomonixemenuxub.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f266c2ac---kezexivadikitujavomeken.pdfIn PDF document text
- http://ulleungroadtour.com/FileData/ckfinder/files/20210906_B711362D780063E9.pdfIn PDF document text
- https://shidoremicrosys.com/media/dajilori.pdfIn PDF document text
- http://bctlorraine.org/userfiles/file/dodexijalatoledofewaxadi.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614657c3ac8d5---mesuwovom.pdfIn PDF document text
- http://thaicockstar.com/ckfinder/userfiles/files/kezivuparo.pdfIn PDF document text
- http://tycoonmedical.com/userfiles/file/21214731905.pdfIn PDF document text
- http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/46103548130.pdfIn PDF document text
- https://nuttydog.hu/ckfinder/userfiles/files/11342987213.pdfIn PDF document text
- https://ww150002.linebot.net/upfile/files/20210905052802.pdfIn PDF document text
- http://ccsl.asia/files/pejaxagimoz.pdfIn PDF document text
- http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/8020950476.pdfIn PDF document text
- https://cristalensi.com/public/File/3492565640.pdfIn PDF document text
- https://shinaltd.ru/images/file/57352839807.pdfIn PDF document text
- http://nguyenphat.com/public/default/ckeditor/files/71976248062.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_off0000dc2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC2F	10792 bytes
SHA-256: `d8bc514e902863b81a514c8c25ebf0a250e754497a001c72369aa8daf5d0efd2`
`font_01_sfnt_off0000f4d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4D3	17712 bytes
SHA-256: `98714e31807f462fa65c413e157150b55992dfc22fc634290249bd066606bdf2`
`font_02_sfnt_off000121aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121AA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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