PDF malware analysis — malicious · 2468dcc50b294539

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 01:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: c0f5bdd222f624ff07ac25c04569329d SHA-1: e780f5cf5c701ceb76fd67953dea8daff6862290 SHA-256: 2468dcc50b294539cdcd0535139f55a6510bb285c28c68a449862fb2fe7e3633

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious PDF files. The presence of invoice-related language further supports a phishing lure attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 7

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679e9ae4a7---wagijonipubuvuwujivikup.pdf In PDF document text
- http://skyline1968.com/clients/74864/File/18003893004.pdfIn PDF document text
- http://dinskayarealty.ru/media/file/81632094904.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2e62ca0a2---77807250758.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lufo8g27e7ktb3051q9q8u5nt4/vekewazarajotixevu.pdfIn PDF document text
- http://porpora.info/imagenes/imagenes_contenidos///porujafitodiwelijamib.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8cf69269c---81780557532.pdfIn PDF document text
- https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/f6a1e89a4246b07f4b19b9fc0e962d9a/xubewukasoxomonaka.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/futcssk0f6b6dgftpaa14lmq8d/60932102408.pdfIn PDF document text
- https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/b799ebd547b30682e7c1d6d6b176c45a/6737414957.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae22584c13f---68940965693.pdfIn PDF document text
- http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cef9543cd---83327351573.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42dd4d384---juxebukipegotepaz.pdfIn PDF document text
- https://ratsimae.ee/media/contents/file/kixegirozevufijataje.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988557b5364---8247342909.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/732p7180ad6upsn1bfl9fvoahk/xudotubipamajajuv.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160787c96b1c1d---85424969190.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4d8e83d742a437f882414aca1f7c11b5/vonisosokig.pdfIn PDF document text
- https://lawina-radom.pl/files/file/8667782092.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3d5594a9bd176307e9f554aac5ac1384/86544191017.pdfIn PDF document text
- http://auapp.ch/userfiles/files/1303815245.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d9ab9680aaacf42a23562565f5b20312/solumamulexudi.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089286dababe---56277598688.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607508c5a01eb---jexosixokozaniweloredura.pdfIn PDF document text
- http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/zuvizapumudede.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=married+filing+jointly+deduction+2020PDF 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_off0000f43f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF43F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010c56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C56	11064 bytes
SHA-256: `fddbd86bf6d768888712c279589bd27a7ee6a8eebff362915df5493560698ca5`
`font_02_sfnt_off0001260c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1260C	17580 bytes
SHA-256: `8d715450416297f674d939ecbc232e903ca7b831c28aa7e3014d11e8012c1c7b`

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