PDF malware analysis — malicious · 9b5d847f67040a7b

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 07:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: ebf69864020c3ee138e04cc36c071c16 SHA-1: 7aceb757e0245f81cb1b7d81f2e35cd8b4083f38 SHA-256: 9b5d847f67040a7b5689b9812651df976e3211438445e7209a8aeff5197ca30d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF format and heuristic firings suggest potential for embedded malicious JavaScript or exploits.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

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.
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://underbutter.cz/download/foto/mewudale.pdf In PDF document text
- http://vkts.se/userfiles/file/waxizurofarubudaxubab.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedf8cc078---57033901856.pdfIn PDF document text
- http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/76463435916.pdfIn PDF document text
- https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/575327ee7ebd125a2a30386243c25ae6/14176226780.pdfIn PDF document text
- http://hmed.vn/upload/files/dojasizusuguxuwap.pdfIn PDF document text
- https://pomtco.com/technical/files/file/62503497919.pdfIn PDF document text
- https://digireg.dk/upload/dukupusebibefamurejej.pdfIn PDF document text
- http://zhxndl.com/uploadfiles/files/vawukuwufanevemupajukizi.pdfIn PDF document text
- https://2-view.org/home/view/public_html/ckfinder/userfiles/files/tofinijukumibutaraso.pdfIn PDF document text
- http://crisismobile.com/ckfinder/userfiles/files/bebodewoziwavamatikofene.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613717db1b9ab---giwizimes.pdfIn PDF document text
- http://loadcell.vn/Images_upload/files/moweguwixapugixaxatesiv.pdfIn PDF document text
- https://astefin.ro/ckfinder/userfiles/files/58468942963.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90371e912---27464258840.pdfIn PDF document text
- https://karpataljaturizmus.hu/upload/52123209764.pdfIn PDF document text
- http://efcosmetic.com/uploadfile/files/risixebuduz.pdfIn PDF document text
- http://ampletrekking.com/userfiles/file/rinuzupopoxinok.pdfIn PDF document text
- https://consultingexpert.eu/fckeditor/userfiles/file/15189670389.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/09afefbcce92061e3ea97cfff6806ec8/49220273793.pdfIn PDF document text
- https://observatoire-omic.org/documents/file/jakaribeganakuwuwibuv.pdfIn PDF document text
- http://tropo-design.com/ckfinder/userfiles/files/66821734745.pdfIn PDF document text
- https://hse.tw/upload/file/wiriwamovamo.pdfIn PDF document text
- http://gadkowski.pl/repository/filemanager/file/pekagefikeborenuxaguw.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae6230119212872e7580605a9170dec1/konipupam.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=word+to+pdf+windows+7PDF 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_off0000b45a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB45A	10280 bytes
SHA-256: `b416a655f305ceefa0761941fb97ea0d0b6820ad7931b93c962cdb423d9fa706`
`font_01_sfnt_off0000cbaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBAF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e3c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3C1	15732 bytes
SHA-256: `dc09478f6b2f84347e75b63d1cb5956ed8fc08f502b24cf643f2f6176fa09daa`

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