PDF malware analysis — malicious · 5f6e07adeb8f2523

MALICIOUS

PDF

88.1 KB Created: 2021-09-16 11:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: c5413bc0107caebf2c6338b77830e043 SHA-1: 4d88d5d4213757517ad5adc5a12b699dbe4e59bb SHA-256: 5f6e07adeb8f25239aa4fbf078c7fd6bd8b165a914a210a0238ce6e1b8aa33ab

172 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including those hosted on what appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, while the link farm aims to obscure the ultimate destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/nqkekc0f3gm499g6bikl8bthru/gogatesupabagexadi.pdf In PDF document text
- http://czytamzezrozumieniem.pl/userfiles/file/8521849787.pdfIn PDF document text
- http://nextgenship.net/upload/file/20210916163177880013.pdfIn PDF document text
- http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/jaxulaxikukamopatan.pdfIn PDF document text
- https://dancleland.com/img/upload/file/73165128097.pdfIn PDF document text
- https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/konobekepuzavuxojur.pdfIn PDF document text
- https://tese.in/ckfinder/userfiles/files/33358360273.pdfIn PDF document text
- http://cameranichietsu.com/luutru/files/gulenulinidobapademu.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f00245e3---29233713317.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161363307289af---fupimorisuw.pdfIn PDF document text
- http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/tatoratosano.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca2d1dd69---mereme.pdfIn PDF document text
- http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/85361917175.pdfIn PDF document text
- http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/wuwawusexekafalidejap.pdfIn PDF document text
- http://songpinhao.com/userfiles/files/61512510722.pdfIn PDF document text
- http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/k1p6n0bs7cj219ahmqv84msr6e/saxijilepavimo.pdfIn PDF document text
- http://studiotecnicoforace.eu/userfiles/files/wevozudawax.pdfIn PDF document text
- https://mastirz.com/userfiles/files/besanudam.pdfIn PDF document text
- https://tenderdiary.com/ckfinder/userfiles/files/tetimusexikobep.pdfIn PDF document text
- http://bsa.by/ckfinder/userfiles/files/23882961107.pdfIn PDF document text
- http://kencert.vn/uploads/image/files/7051945612.pdfIn PDF document text
- https://cezartravel.hu/userfiles/file/bumobidulumotumiwunowefak.pdfIn PDF document text
- https://letajicikoberce.cz/userfiles/file/vuradusemutapimakonuno.pdfIn PDF document text
- http://se-ty.ru/uploads/userfiles/file/ralaxekinedasabapawu.pdfIn PDF document text
- http://ceramkgres.ru/userfiles/file/26113502378.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/dulunakigudinibavure.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nkjv+free+download+for+androidPDF 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_off0000eebc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEBC	10432 bytes
SHA-256: `7eacf43829f4a0cb066cde1954d3d4def38394c9e50340d9e6bd3827aa32de3e`
`font_01_sfnt_off00010679.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10679	20044 bytes
SHA-256: `c374a4c22add89301a875809d3decee0f05487bd7a055813feb896a27ca5b35a`
`font_02_sfnt_off00013a42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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