PDF malware analysis — malicious · 2532431a89a50e5a

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 08:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 5e4a2519fc04a84b513ea291155b01b5 SHA-1: ad40f35a7156236fb77561cd31e80c9f7677d0e5 SHA-256: 2532431a89a50e5a646e39cd38688d89ef2eafa708bd18a45b51dc68670f3a30

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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://seksdagen.nl/userfiles/file/17147605538.pdf In PDF document text
- http://etpatatietpatata.com/userfiles/files/zowinuvefov.pdfIn PDF document text
- https://cebrigantina.com/025-CEB/images-editor/file/4514033701.pdfIn PDF document text
- http://laxycoffee.com/upload/files/10467639745.pdfIn PDF document text
- http://100gastro.cz/soubory/files/lobufulijapajokuvupula.pdfIn PDF document text
- http://avandcie-energy.fr/ckfinder/userfiles/files/xitajesitamuwise.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b12a7299---jerodugeri.pdfIn PDF document text
- https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a9e24c9a475d9c0f6c80e77b2417e3de/37330038337.pdfIn PDF document text
- http://consol.hu/images/uploadedimages/file/88862850063.pdfIn PDF document text
- https://lockerova.eu/admin/upload/documents/65154009498.pdfIn PDF document text
- http://crabandclaw.com/uploads/files/14945078938.pdfIn PDF document text
- https://i-chat.tw/js/ckfinder/userfiles/files/fagukekukula.pdfIn PDF document text
- https://shieldtech.cz/ckfinder/userfiles/files/4413445491.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/def3lj7v0j11ongaghvjdgcvng/48677274617.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d4e1b098---fosavugosagod.pdfIn PDF document text
- http://smolninskayahotel.com/userfiles/file/gipepoxupor.pdfIn PDF document text
- http://diagnosticaedilizia.com/userfiles/files/97300875036.pdfIn PDF document text
- http://www.ishvani.com/www/js/ckfinder/userfiles/files/godirebiniroto.pdfIn PDF document text
- http://www.hkrns.org.hk/ckfinder/userfiles/files/12883020601.pdfIn PDF document text
- https://urbanlivin.lu/userfiles/files/10089939517.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/12dfee333284a88f569aa69699a23899/28577730383.pdfIn PDF document text
- https://pirkitpadangas.lt/ckfinder/userfiles/files/xazalogojofewevejo.pdfIn PDF document text
- https://amthanhanhsangchinhhang.vn/upload/files/xanupimozomowa.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=odd+even+prime+and+composite+numbersPDF link annotation
- 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_off0000dadd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDADD	18860 bytes
SHA-256: `8cda2b2bd362025bd86b3cc68a6bed648f6848346220a9b2d5a0ebb09bdad749`
`font_01_sfnt_off00010ba0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BA0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000123b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123B7	10960 bytes
SHA-256: `9c31d0737ffd85742650430d4367587376f4f8611c9f913b2a23d1eeb14419de`

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