PDF malware analysis — malicious · edb4c3ad6d801281

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 05:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 42774f69666b5ce99b423ce7f2a9e694 SHA-1: 2da3279f2456618bb91aa42e07c880e2434c5c9c SHA-256: edb4c3ad6d801281c11d10a9ebfb679ea90ae5f92f0bd4398063f1e2cc126a97

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous URLs indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=intensifiers+with+comparatives+exercises+pdf PDF link annotation
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a7b91e7b532b660e037ba41fbb3e71e4/sidibuvuguwiw.pdfIn PDF document text
- http://forter.vn/hinhanh/file/ruwirujakazawunugo.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967333e44dc---femiridugikejigi.pdfIn PDF document text
- https://nodka.eu/ckeditor/ckfinder/userfiles/files/muduvov.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/359cf10cf0ffe89531a084d42b5efb34/85573545089.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c8e44d306---74925476998.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/69b3d8d22f00412e5d83ecdf242531f0/xuralanezatajekonejevixaw.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1f8d79ef295a0b1483e5f0d7fe853a91/novuwewik.pdfIn PDF document text
- https://kuzeyilac.com/resimler/files/mukitujoroguvoweboluf.pdfIn PDF document text
- http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d03d614e125---dunogujej.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0bfbd1ab9---venebapokazovuwerodor.pdfIn PDF document text
- https://louvre.lv/res/wysiwyg/file/garowoduzosabewowakuket.pdfIn PDF document text
- https://www.hmgfinance.com/ckfinder/userfiles/files/39154111800.pdfIn PDF document text
- http://isystem.hu/userfiles/file/94391190390.pdfIn PDF document text
- http://impressivetravelvietnam.com/upload/files/kexizigofasasonagu.pdfIn PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc75a86e5---nogafilifes.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eebf3c31f---8859454027.pdfIn PDF document text
- http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9ae57187---boguxetimugesavetaxe.pdfIn PDF document text
- https://visionbrindes.com/admin/fckeditor/userfiles/file/37404690612.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc766e2f9---52584929198.pdfIn PDF document text
- http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc062caf1b---36722476268.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f336ca94b23---62910861651.pdfIn PDF document text
- https://cuisinescartier.ca/upload/editor/file/18532684450.pdfIn PDF document text
- https://delaneyllc.com/ckfinder/userfiles/files/9603038534.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e0a4d620---39007266690.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f854473d---sijejomugupekupavuj.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_off0000d740.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD740	11044 bytes
SHA-256: `3a97a44ff325162b4afbd78a73f714397c464f21494809cdee0313fc8d3c4410`
`font_01_sfnt_off0000f0e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000108f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108F2	18552 bytes
SHA-256: `99b87f05246e5c88bcdacc5bd2e114baefdbc00d12eee978465d76b342ce8d21`

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