PDF malware analysis — malicious · 06da735fb48afc65

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 12:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 029f46191a7e9a8f1044487fd2acb846 SHA-1: 99790f7f2b2d5c5bd6c907644689643bcef7f76e SHA-256: 06da735fb48afc65ccf0fdec91fe972885b57bbea0f9a643b7cf111e93f044d8

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs disguised as PDF files, hosted on various domains, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable hosting, suggesting an attempt to obscure the true malicious destination. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=chief+magistrate+court PDF link annotation
- http://alburigiott.it/userfiles/files/tidusoj.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09d2f322a---91242013845.pdfIn PDF document text
- http://abimobiliare.pl/pliki/File/53489754678.pdfIn PDF document text
- https://cargotavio.ru/files/file/sokonerozagoruzujuzaneron.pdfIn PDF document text
- https://webmanagement.jbclub.ro/images/file/31219915039.pdfIn PDF document text
- https://hoangvan.vn/wp-content/uploads/files/tozulotevemej.pdfIn PDF document text
- http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/74132612282.pdfIn PDF document text
- http://elosc.com/upFile/file///ITX202109032231095497.pdfIn PDF document text
- http://evrofurnitura.by/elax-furnitura.ru/uploads/files/ninupajupit.pdfIn PDF document text
- https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/41835528839.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ue1je865kharla2as3rcne4qoq/30780086791.pdfIn PDF document text
- http://bike-aholic.com/UserFiles/file/41955540726.pdfIn PDF document text
- http://personnelstrategies.net/userfiles/file/61937350563.pdfIn PDF document text
- http://essentielles-theater.de/UserFiles/File/vetexozufowejugu.pdfIn PDF document text
- https://letajicikoberce.cz/userfiles/file/92999508885.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa03b55dfa---sixozumikoxevake.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8c356bb7e444f91d9766244d1a21746e/61758872114.pdfIn PDF document text
- http://vasekurzy.cz/userfiles/file/47831719275.pdfIn PDF document text
- http://ccshecea.org/upload/files/52790954514.pdfIn PDF document text
- https://pirkitpadangas.lt/ckfinder/userfiles/files/11068739758.pdfIn PDF document text
- http://yonseri.org/userfiles/files/sekopiwinoverezetaso.pdfIn PDF document text
- https://scalper.ir/data/files/file/54307715676.pdfIn PDF document text
- http://frutapacargentina.com/ckfinder/userfiles/files/67316971598.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_off0000b243.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB243	10764 bytes
SHA-256: `fd87e21770e5fc94d854e99a10df8be667d556be2ac0f949bee9e0ba4e208f8b`
`font_01_sfnt_off0000cb24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB24	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e336.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE336	15972 bytes
SHA-256: `b844ac5328fdd002234280ff2b39c7963a5fb7826e6db3232841839515ef8777`

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