PDF malware analysis — malicious · 7205fd8539a3cba9

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 13:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 5c856ee532209f1f981bd9c69e37f388 SHA-1: 914d6ab26da97dcd9155e73ea47cfa0ba9a2df02 SHA-256: 7205fd8539a3cba9f6b44d089546b72c60c750ff6aef87989e05e48e3e4c331e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9829

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 https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/53259478830.pdf In PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970689c409---baguvijobubamobupak.pdfIn PDF document text
- http://paulgraphics.paulsfashion.in/files/domanukewuwezaxog.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b7e5a8cc---62418779253.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9242a7d0---xejovarexinojat.pdfIn PDF document text
- http://zzzwchem.com/upload/files/95179089619.pdfIn PDF document text
- https://norservis.com/files/files/sutewezekaxavekusaden.pdfIn PDF document text
- http://greatwalledmond.com/ckfinder/userfiles/files/7657626110.pdfIn PDF document text
- http://rudolphalexander.com/uploads/files/54804191321.pdfIn PDF document text
- http://booklandbooks.com/userfiles/file/21782522713.pdfIn PDF document text
- http://usefchina.com/uploadfile/file///2021090320030252.pdfIn PDF document text
- https://capital-publishing.com/ckfinder/userfiles/files/87693934027.pdfIn PDF document text
- http://cityclick.it/userfiles/files/merejo.pdfIn PDF document text
- http://ndt-ultratech.com/files/2166462764.pdfIn PDF document text
- http://mibenjamin.com/userfiles/file/68491638213.pdfIn PDF document text
- https://balbok.net/admin/ckfinder/userfiles/files/kedulaxuvoko.pdfIn PDF document text
- http://timebank.ru/sites/default/files/photos/pagefile/wolopotuwefosobone.pdfIn PDF document text
- http://tiramisu-o.com/yamituki-n/uploads/files/monubabarawirinizivizisu.pdfIn PDF document text
- http://progfin.pl/userfiles/file/55521373632.pdfIn PDF document text
- http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/94399931003.pdfIn PDF document text
- http://arisutour.com/ckupload/files/wiramolotufolodumi.pdfIn PDF document text
- https://tolgyesvolgy.hu/userfiles/file/geduwarakexuxodopirimuxi.pdfIn PDF document text
- http://starwindows.ie/ckfinder/userfiles/files/74456212197.pdfIn PDF document text
- https://voziky-paletove.cz/mctree.cz/pictures/other/files/15094803301.pdfIn PDF document text
- http://gocchame.vn/app/webroot/img/uploads/files/kefilafitevikax.pdfIn PDF document text
- https://happycondo.leaddeehub.com/userfiles/files/kekidirivowunililozarixov.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thermal+engineering+book+pdfPDF 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_off0000ce9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE9D	10876 bytes
SHA-256: `43aca06f93e13257c1a86bfb95021abfebb2e1151df3bf05f89b21ba4f6256c6`
`font_01_sfnt_off0000e705.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE705	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ff17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF17	16780 bytes
SHA-256: `dd0ef825c2c87742d7f68f095aaa76c63c4b46137bb11cc2e2e3ac9096d14b49`

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