PDF malware analysis — malicious · 723ae7a1aa9e72dd

MALICIOUS

PDF

83.1 KB Created: 2021-10-08 22:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 81e3903b2aad8b14ec91a2a435297219 SHA-1: aa482cb700a6091f5320ed5ca7198ecc75f821c5 SHA-256: 723ae7a1aa9e72dd42a423923d7bf75544e5e94bc8aa64a1d401f89876c57733

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that lead to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://queure.ru/uplcv?utm_term=mucosal+meaning+in+tamil PDF link annotation
- https://nusamulticentralestari.com/Uploads/userfiles/files/56358343688.pdfIn PDF document text
- http://krukaiart.com/userfiles/files/gosukurasivurudegetov.pdfIn PDF document text
- http://btsoft.vn/uploads/files/85357357232.pdfIn PDF document text
- http://zenobiacultura.it/userfiles/file///lamudinisu.pdfIn PDF document text
- https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/01a7aa61820c3b77a8408d7369ad8a55/lemodozapewosewogebu.pdfIn PDF document text
- https://tidurmalam.com/contents/files/nadixulezolabiwadiva.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8d4264cf14f9a344b009c22d1c7ff9c/jodoxemekujibovimudur.pdfIn PDF document text
- http://zulassungsservice4you.de/bilder/file/ketipemovukomaj.pdfIn PDF document text
- https://maisonforville.be/documents/file/kotobexikekenuse.pdfIn PDF document text
- http://annamsaigonlaw.com/upload/files/23226471856.pdfIn PDF document text
- http://studioagm.it/userfiles/files/tiwisagebonavogikoted.pdfIn PDF document text
- https://opremazabebe.me/userfiles/file/95104740559.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef5444a89.pdfIn PDF document text
- http://engcaphone.com/_UploadFile/Images/file/45739628791.pdfIn PDF document text
- http://wccflooring.com/userfiles/files/58701864938.pdfIn PDF document text
- http://location-appartement-venise.com/italie_documents/files/tekitabu.pdfIn PDF document text
- https://barcelona-health.com/files/galeria/files/37999334176.pdfIn PDF document text
- https://loppisidjupdalen.se/images/uploaded/file/22348374099.pdfIn PDF document text
- http://gewidor-gmbh.de/uploads/files/fevibewuju.pdfIn PDF document text
- https://ryokanclub.com/FileData/ckfinder/files/20211006_2524B4ABC87445EF.pdfIn PDF document text
- https://baoyi-chuck.com/ckfinder/userfiles/files/geruxisuku.pdfIn PDF document text
- http://urparitet.ru/admin/ckfinder/userfiles/files/42802316192.pdfIn PDF document text
- http://pincailight.com/zk/UploadFile/file/2021100101292873499.pdfIn PDF document text
- http://jrecchina.com/ckeditor/ckfinder/userfiles/files/nokabokej.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_off0000d618.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD618	21980 bytes
SHA-256: `66840b9fc7a2409cafddda3900d2c0d71f1e1eaddbe8626f337ed67c30aeb068`
`font_01_sfnt_off00010e93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E93	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000126aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126AA	10564 bytes
SHA-256: `7f53462856984f0f8ef4df22f3e04090464abf88d6b77ce402b9717b0c156e4e`

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