PDF malware analysis — malicious · 9ccb18257c17dbd8

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 17:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: fe55388c7265870bd9aa1d7e643d4295 SHA-1: 827518f6ba99525b316b5e1a4b3cc1f22e584ce5 SHA-256: 9ccb18257c17dbd848130ab13134bb57fcf721ddbb0f253ba80bdc8a989bf1fa

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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
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://synerhu.ru/uplcv?utm_term=love+unholy+otome+game PDF link annotation
- https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/92477694945.pdfIn PDF document text
- http://thementalhealthadvocates.org/files/userfiles/file/3925327003.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e584689c77---61582201612.pdfIn PDF document text
- http://eros-arena.de/eros/userfiles/file/pivowu.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614193727f8d3---63912344469.pdfIn PDF document text
- http://www.biogreeno.com/cms/ckfinder/userfiles/files/zizewokevakagokodizojub.pdfIn PDF document text
- https://kabelkyaobuv.sk/editor_uploads/files/98294602849.pdfIn PDF document text
- https://newsale.linyn.mobi/upload/ckeditor/pages/files/xexewegonu.pdfIn PDF document text
- https://marjoyunlar.com/calisma2/files/uploads/mubimosekikisi.pdfIn PDF document text
- http://grupposcorcia.it/userfiles/files/38913526273.pdfIn PDF document text
- http://servmed.net/userfiles/file/fepewikijisakuninitusir.pdfIn PDF document text
- http://ubytovani-budejovice.cz/picture/vtextu/file/27264383254.pdfIn PDF document text
- http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/davut.pdfIn PDF document text
- http://hotelgiottotorino.com/userfiles/files/jijidavepodijizevula.pdfIn PDF document text
- https://creativitagh.com/pevron/www/img/file/wazunumeki.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140942208895---10855537723.pdfIn PDF document text
- http://apvn.info/userfiles/file/mowevinibumererepowas.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/951uobjheirh24e3ujb386tgi0/ralajiwon.pdfIn PDF document text
- http://nuklearmedizin-amro.de/userfiles/file/71854383314.pdfIn PDF document text
- https://sysyanginguvenlik.com/uploads/files/11926877256.pdfIn PDF document text
- https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/gaxaxorabozeniva.pdfIn PDF document text
- https://rent-1.es/ckfinder/userfiles/files/voduvijironede.pdfIn PDF document text
- https://mimpiindahsatu.com/contents/files/75113328046.pdfIn PDF document text
- http://tantex.org/tantex/tantexuserfiles/file/binikurozujelu.pdfIn PDF document text
- http://newworldss.com/uploads/file/wugikaxapakeripa.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_off0000bf86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF86	20256 bytes
SHA-256: `eba169a16b581ae0b56acee9c392af4be0302832f68a8168f9eaa9d047c27828`
`font_01_sfnt_off0000f3a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010bc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BC0	10432 bytes
SHA-256: `c300e86f759ea9afa2350e654bc29bc5f79b4815f7e8a3e22d0401ec2d755fb2`

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