PDF malware analysis — malicious · cf3f3be9b459108b

MALICIOUS

PDF

92.0 KB Created: 2021-08-14 07:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16

MD5: 55f49772f09e9c90b7e2ea8f3d4e5ab3 SHA-1: cf9c397f9394bea7e38390550229373587f9510f SHA-256: cf3f3be9b459108b60ea4925fcccdd7fb7f4fa25bf39ed20badfc702a138d1a1

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable domains or compromised CMS uploads. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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://coretry.ru/uplcv?utm_term=systems+performance+brendan+gregg+pdf PDF link annotation
- https://bataretak.com/img/files/file/kefanomu.pdfIn PDF document text
- https://immo-cjeanpaul.lu/userfiles/files/1881840766.pdfIn PDF document text
- http://anadolumatbaa42.com/genelresimler/file/7941813483.pdfIn PDF document text
- https://pomacanthe-art.fr/imagebeforeafter/files/21961387150.pdfIn PDF document text
- http://hpmcfamilyreunion1968.com/clients/83891/File/lufudogosufe.pdfIn PDF document text
- http://www.mbk-montage.nl/ckfinder/userfiles/files/45475891797.pdfIn PDF document text
- https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f360ba194---29759529330.pdfIn PDF document text
- http://vning.net/filespath/files/20210807212000.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1gvom1jm7sm8oepp0aksqffco8/ligubiniwupiwelat.pdfIn PDF document text
- http://kimsanghun.com/upload/userfiles/file/2021810213489525.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hj8rm9gdqntdiob4527rnf51a2/68441075667.pdfIn PDF document text
- https://embassyinvietnam.com/webroot/img/files/43779468272.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c239272eefa---25275432924.pdfIn PDF document text
- https://ngusacdon.com/upload/files/35886333697.pdfIn PDF document text
- http://gold-carsales.com/js/upload/files/sumetarukup.pdfIn PDF document text
- http://erex.hu/upload/file/53687808663.pdfIn PDF document text
- http://istvietnam.com/rich_editor/file/6401964565.pdfIn PDF document text
- http://puginternational.com/ckfinder/userfiles/files/57763892827.pdfIn PDF document text
- http://www.zywawiara.pl/pliki/63870974430.pdfIn PDF document text
- https://arerp.kr/data/file///xegixiruvepelotuliz.pdfIn PDF document text
- http://cuadepthanglong.com/images/ckeditor/files/16207979388.pdfIn PDF document text
- http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/95897651548.pdfIn PDF document text
- https://corumosmanlimakina.com/js/ckfinder/userfiles/files/98001119417.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a2f1ec443---4735719783.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_off00010019.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10019	11156 bytes
SHA-256: `d8a1c631ec3e0e024b6e5daf76d885318a06ff47cb886d7ed8af02912462aeaf`
`font_01_sfnt_off000119c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119C0	17944 bytes
SHA-256: `7254f86d881aaa8754f16dcc9c059b69835d8fd0de9a84479ce710436affab4f`
`font_02_sfnt_off000148dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x148DC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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