PDF malware analysis — malicious · fd62a0f2aa054984

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 13:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 23844b40026c0aa3737a0662dc0c255a SHA-1: c3d3273fac9d309409e1e8d73e0b55f46170102b SHA-256: fd62a0f2aa05498480b5e3df37365d5a27ddcd9b6167f804f6101e0c32be273d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://ktcz.eu/files/files/71806148771.pdf In PDF document text
- https://intervalhousehamilton.org/ckfinder/userfiles/files/49471461239.pdfIn PDF document text
- https://autohausnschmidt.de/userfiles/file/jolararabanizopatudus.pdfIn PDF document text
- http://feach.ie/images/uploads/file/tiboxifadabifejo.pdfIn PDF document text
- http://www.ctnphrae.com/ckfinder/userfiles/files/wegimi.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614849a54543f---68358873959.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161366663e99e1---somiwuwin.pdfIn PDF document text
- http://elvirajogsi.hu/ckfinder/userfiles/files/jejubebasodovuvuretex.pdfIn PDF document text
- https://spirit-legend-enterprises.com/webroot/editor-uploads/files/pamanizazisuza.pdfIn PDF document text
- http://chistogood.ru/admin/ckfinder/userfiles/files/sobik.pdfIn PDF document text
- https://nacituran.com/userfiles/file/wibobokimudizojuruwizuju.pdfIn PDF document text
- http://spartaksedlec.cz/spartaksedlec/userfiles/file/mavifo.pdfIn PDF document text
- https://fishboat.hr/files/rifitogab.pdfIn PDF document text
- http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/19820135633.pdfIn PDF document text
- https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/83488782a7a21bb2cb25447d61fd586e/rurolewalo.pdfIn PDF document text
- https://moveo-sport.pl/userfiles/file/paxox.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef7c6cbb2---weresipatofo.pdfIn PDF document text
- http://cokhiminhhien.com/media/ftp/file/wogaxitu.pdfIn PDF document text
- http://remproekt-m.ru/admin/ckfinder/userfiles/files/78519509102.pdfIn PDF document text
- https://habrit.tw/ckfinder/userfiles/files/nixufad.pdfIn PDF document text
- http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e56acebbe---delemowi.pdfIn PDF document text
- https://floridainvestment.cz/files/file/69610085574.pdfIn PDF document text
- http://gysanya.com/upload/file/210912181035096396lzddnujhzlvc.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=moto+bike+racing+game+downloadPDF link annotation
- http://pro.ovh.net/~tribuene/images/banque/file/37696460633.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_off0000b44e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB44E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cc65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC65	10856 bytes
SHA-256: `4cd036d8bf4871a211a26af6fe02714d3fd4aeca0aecb1747edba446a086930a`
`font_02_sfnt_off0000e551.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE551	15352 bytes
SHA-256: `8f58887a84bae148f01782c2e3d002955d088c7d9f68e8421e4ec55ba0e2a51f`

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