PDF malware analysis — malicious · 3dd486647c614751

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 04:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ae457489f132dabdb7f01e9053d66d15 SHA-1: 71016fa75aa83364861f237a6838cae85cbe4337 SHA-256: 3dd486647c61475126eb3becbf1bb2562965547472af1dce1fde212ebe194e39

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate a likely attempt to distribute malware or phish credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 6

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.
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://catamma.ru/uplcv?utm_term=programa+aprender+emprender+y+prosperar+pdf PDF link annotation
- http://skkouty.cz/ckfinder/userfiles/files/50052110956.pdfIn PDF document text
- http://gpkoaee.ru/ckfinder/userfiles/files/ridubar.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f288ed9e203---30052283776.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/70221398278.pdfIn PDF document text
- http://autoscuolecasetta.it/userfiles/files/5482262158.pdfIn PDF document text
- https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/10ce6132e91033802f54f4de77b48e6b/tegapopazadazaser.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tc807vhmmc67cvut7vbk9uml4f/satadigaxetex.pdfIn PDF document text
- http://polyalpan.hu/_user/file/pejijulosejukajedidim.pdfIn PDF document text
- https://urology-andrology.com/userfiles/file/pisesigufaxoxaxobox.pdfIn PDF document text
- http://restokrat.info/userfiles/file/14586315844.pdfIn PDF document text
- https://caribemed.com/userfiles/file/4370812862.pdfIn PDF document text
- https://ckmusicdesign.nl/userfiles/file/19624104936.pdfIn PDF document text
- http://frappsreagent.com/upload/files/dadadamodofobox.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/711680d51538b766a289562872ece013/57881896448.pdfIn PDF document text
- http://saigondome.com/uploads/userfiles/file/mobemi.pdfIn PDF document text
- http://compufoxmail.com/userfiles/file/2796804690.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/g2fconoq9kiog930jhsqdemlaf/61329080030.pdfIn PDF document text
- https://trsoftyazilim.com/genelresimler/file/fakikabugejagulefotud.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/259e8a7e5526f2edacb3e403b0f316ed/wilisarasalirutedunu.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b732e288dae---31536968966.pdfIn PDF document text
- https://coil.hk/upload/files/20758496480.pdfIn PDF document text
- https://global-product.org/CKEdit/upload/files/21950098135.pdfIn PDF document text
- https://gkscam.com/userfiles/file/35308587629.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/0oqkdku03usc6dohtil8kc67gn/16711937491.pdfIn PDF document text
- https://bancodevida.com/bancodevida/admin/images/image/file/nufudixetebot.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_off0000d130.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD130	10720 bytes
SHA-256: `46b6125df78ab3855d3668914619ceddc2e2829dc8b3f09dc694b97f9cecb0e4`
`font_01_sfnt_off0000e998.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE998	19484 bytes
SHA-256: `82a2e8dc926cb38f3baaf3a0ed145d0516909b61c8a5a7e0f26c46e1e0a8cbef`
`font_02_sfnt_off00011a86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A86	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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