PDF malware analysis — malicious · dd5f74c0ab579000

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 00:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ecbe3a06ba6d1f6641b22c8b99ffce5b SHA-1: 712f31eecc85f82372c50d531a43441727b2d19b SHA-256: dd5f74c0ab579000d103efba1830531010446db789c6381355cc4ad2431b7506

132 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

Nyx PDF Classifier suspicious score 0.4212

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.
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
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://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/wapufumujo.pdf In PDF document text
- http://dexgerm.com/data/file/userfiles/files/foxazilozatiluveme.pdfIn PDF document text
- http://hillsdalehorseboarding.com/ckfinder/userfiles/files/70543474692.pdfIn PDF document text
- http://dgkno.cn/upload/rinuwuvi.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jedepojibomajomawufagena.pdfIn PDF document text
- http://xdata.pl/app/webroot/img/ckf/files/nojujudesadamikobedowe.pdfIn PDF document text
- http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/94279868118.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19c180279---wozesusimolaza.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff9b981ae---pufexisiwelareromuzesabi.pdfIn PDF document text
- http://nesemlak.com/test/images/uploads/files/sijuwosobulugokopurer.pdfIn PDF document text
- http://neodermclinic.com/file_media/file_image/file/19666868702.pdfIn PDF document text
- http://ballarioarchitetti.eu/userfiles/files/fanewenigonadetatur.pdfIn PDF document text
- https://indiantalentjunction.com/milan/media/30702416826.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38ced5587---60280002255.pdfIn PDF document text
- http://gaishachuukobuhin.com/js/upload/files/14024715099.pdfIn PDF document text
- http://moskvaznaet.ru/upload/files/39174332363.pdfIn PDF document text
- https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/nalakarizejetasumaxazu.pdfIn PDF document text
- http://owv-sad.de/userfiles/files/weropubunafesujujewusal.pdfIn PDF document text
- http://mestan.by/images/file/rotupepexiboxarulukudaw.pdfIn PDF document text
- http://ngocphuocjsc.com/public/default/ckeditor/files/1238945346.pdfIn PDF document text
- http://sinproval.it/userfiles/files/xilam.pdfIn PDF document text
- http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/lazomepobegusotejerula.pdfIn PDF document text
- http://icsbc.ru/fuploader/file/rifix.pdfIn PDF document text
- http://geojeoceanhotel.com/userfiles/file/20210911235700.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=google+app+for+android+mobilePDF link annotation
- 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_off0000dc20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC20	10756 bytes
SHA-256: `bf90fb6f33ed6cad80e01c9d9acb6da8dfe781a312f314d50ef9cbe4ec5e0d9c`
`font_01_sfnt_off0000f45a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF45A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010c6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C6C	18388 bytes
SHA-256: `3660f97efbf29efd978e4d019aaa2b6d7b514999c28d2d8ac525f44ecb2c06c0`

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