PDF malware analysis — malicious · 60692dfd794b300c

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 14:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 2af777c2e37b14ca195437fdbd0bfe2a SHA-1: 6d6991463968c7e2c12211477055d36d10b83d14 SHA-256: 60692dfd794b300ca119ba3fe3244bd79ac424fc912f3451b7e4d869f72850af

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm structure, with many links pointing to disposable or compromised hosting, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as malicious. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing site.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/79030762906.pdf In PDF document text
- http://gyarmatilovastorna.hu/userfiles/file/46111020559.pdfIn PDF document text
- http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gujufojomor.pdfIn PDF document text
- https://beta.nhatthiengroup.com/files/uploaded/files/polerimizadegonovure.pdfIn PDF document text
- https://hamzakocakoglu.com/userfiles/file/45827327325.pdfIn PDF document text
- https://styliststudios.com/imagesTE/file/dodukevexezem.pdfIn PDF document text
- http://banquat.com/userfiles/files/zovuradololup.pdfIn PDF document text
- http://cdio.vn/uploads/userfiles/file/7233909565.pdfIn PDF document text
- http://greenglobepms.com/uploads/xetirotaw.pdfIn PDF document text
- http://marcus-1.com/FileData/ckfinder/files/20210909_1DD58C9897C26C5F.pdfIn PDF document text
- https://gopherscopes.com/userfiles/file/tedazozowuvepotenirato.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/32826084dc572a78dd76f8b919e26745/ronabilazusakabiwonir.pdfIn PDF document text
- https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c077e859c0fc58f97df15ddfe027bdce/9978745924.pdfIn PDF document text
- http://belgium-ex.com/images/blog/file/37265024973.pdfIn PDF document text
- https://enerjimakine.com/tsrm1/img/userfiles/file/69156604931.pdfIn PDF document text
- http://sunrui-ti.com/d/files/patememarid.pdfIn PDF document text
- http://innobiztour.com/FileData/ckfinder/files/20210903_3C6E1E2E58BB5BDF.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4247a0698---7809347727.pdfIn PDF document text
- https://hram-uspeniya.ru/ckfinder/userfiles/files/69181204261.pdfIn PDF document text
- http://travelsi.ru/ckfinder/userfiles/files/vejutafeguwovufe.pdfIn PDF document text
- http://falerisztika.hu/tmp/rejizoredululijebafovona.pdfIn PDF document text
- http://mmsmarin.com/imgimage/file/67899002486.pdfIn PDF document text
- http://mvpbuilding.com/userfiles/file/ralaxojewe.pdfIn PDF document text
- http://fibertechnique.com/tmp/file/22428010641.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+emulator+play+store+installPDF link annotation
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349fee7a724---mekawivumukudiduxizusesu.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_off0000e9e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9E3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000101fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101FA	10748 bytes
SHA-256: `e637d95eef28607d4251b8fa35713f7103e7931cab89d759043e12f85c0fab05`
`font_02_sfnt_off00011ab4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AB4	17576 bytes
SHA-256: `44e44f5688eb94f328afe9b1e962de65a79cee3513cb7de1b9a9e8720fab876c`

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