PDF malware analysis — malicious · 64e648844aa44c13

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 08:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: f57f75a37cf6a24f036b8e79dd5ac53b SHA-1: ef12578437f23468d32ebdc3748ee1dce64ee037 SHA-256: 64e648844aa44c1330122b6975da2102856ff3ee292e607e49dffb3d883c25d1

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to initiate malicious actions such as downloading further payloads or redirecting users. The presence of numerous external URIs, including those hosted on compromised CMS uploads and disposable hosting, indicates a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier strongly support its malicious nature.

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://wastran.ru/uplcv?utm_term=hsc+biology+book+pdf PDF link annotation
- https://mabuksusu.com/contents/files/tupogaxewiziful.pdfIn PDF document text
- https://reaga.net/js/ckfinder/userfiles/files/69692620690.pdfIn PDF document text
- http://netichikawaya.com/userfiles/file/18920274904.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615141bc96f26---37601139066.pdfIn PDF document text
- https://mptradingcompany.com/userfiles/file/90644613664.pdfIn PDF document text
- http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76333493332.pdfIn PDF document text
- https://geniodelweb.com/file/34947817682.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161351627b3b86---zexim.pdfIn PDF document text
- https://vidaleve.net/ckfinder/userfiles/files/kesakesuxogiw.pdfIn PDF document text
- http://haohanlegend.com/Uploadfiles/files/13629545209.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/dmt92c04fvnn03re7bk3fofdga/kelatimatutoguzetore.pdfIn PDF document text
- http://thangmayedex.com/webroot/img/files/gavebefotibajikubamabire.pdfIn PDF document text
- https://kluchar.net/klucharnet/images/file/rorubaw.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140a862aae68---verunomakepof.pdfIn PDF document text
- https://photojet.bg/userfiles/file/54006693970.pdfIn PDF document text
- https://girl0229960192.com/upload/users/files/38966366522.pdfIn PDF document text
- http://ankamet.com/userfiles/file/tuxatirorax.pdfIn PDF document text
- http://ttccid.com/userfiles/files/zixumuzidutuma.pdfIn PDF document text
- http://ukrfirework.com/images/file/22545097223.pdfIn PDF document text
- http://vaonhaphatphap.com/images/uploads/files/32081045616.pdfIn PDF document text
- http://chaodontuonglai.vn/uploads/ck_upload/files/xixemofojebus.pdfIn PDF document text
- http://galeriejacqueselbaz.com/userfiles/file/gipizuwelebekugaxibubogog.pdfIn PDF document text
- http://occahomesearch.com/userfiles/files/20340866586.pdfIn PDF document text
- http://futimisdev.com/userfiles/file/1578116848.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_off0000b3b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3B3	10536 bytes
SHA-256: `acfa3e62ff5b1d37656db54a575507b6950d63b9283d060c95f64f799c01d9e2`
`font_01_sfnt_off0000cb57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB57	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e369.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE369	16964 bytes
SHA-256: `478aed7193e2c5926cabc4d6c0b3a9ab6b69ea91b720a95356bb1f2659bfe9c3`

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