PDF malware analysis — malicious · 4ed58ae48f468a22

MALICIOUS

PDF

71.2 KB Created: 2021-10-04 11:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 21613f788230252a23ca8c4c81155284 SHA-1: ad5fe8d3a0f0c6f1df2e94bbfdd4cb45de860863 SHA-256: 4ed58ae48f468a22dcfe97b4a0bc35e5e718560af70dbcd8f5bb5d33aa02a5bb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains a link farm pointing to multiple unknown URLs, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the heuristics strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://tekizolasyon.com/ckfinder/userfiles/files/66700802946.pdf In PDF document text
- http://zavalinka.by/var/upload/file/14206766163.pdfIn PDF document text
- https://rabudiagnostic.com/userfiles/files/mebazepujugunapovif.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151b10253a4a---88264943683.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615774c106051---28818687572.pdfIn PDF document text
- https://farmaciasacoor.com/site/upload/file/94370672222.pdfIn PDF document text
- http://udmvdpo.ru/images/files/5821252322.pdfIn PDF document text
- http://richardchong.com/userfiles/files/7437974859.pdfIn PDF document text
- http://cuacongtudongbinhduong.com/upload/files/29873099471.pdfIn PDF document text
- https://markapin.com/calisma2/files/uploads/muwuxapuseba.pdfIn PDF document text
- http://juentai.com/userfiles/files/pawajirorodajibizukafef.pdfIn PDF document text
- http://circolosilverblufitnessclub.eu/userfiles/files/rewexaxuge.pdfIn PDF document text
- http://inwama4.vn/webroot/img/files/girawulekupunupoj.pdfIn PDF document text
- https://hsdinstruments.nl/uploads/files/pimupesokakigisiz.pdfIn PDF document text
- https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/32320807001.pdfIn PDF document text
- http://nurugelexport.com/ckfinder/userfiles/files/73526694161.pdfIn PDF document text
- https://journalofcritique.com/ckdosyalari/upload/files/70594760458.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161440e8813785---95762523657.pdfIn PDF document text
- http://sfalojistik.com/userfiles/file/87973389616.pdfIn PDF document text
- http://woodbridgeabw.com/uploads/files/mefapeb.pdfIn PDF document text
- http://cameralehiep.com/hinhanh_fckeditor/file/97783686527.pdfIn PDF document text
- http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/wiziw.pdfIn PDF document text
- http://ride-on-earth.com/images/blog/file/kitojux.pdfIn PDF document text
- http://toflight.mobi/attachment/ckeditor/files/385465c216c72146c04e4c324e845e74.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=meaning+of+the+word+repugnantPDF 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_off0000b4ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4BA	10740 bytes
SHA-256: `7bd6520cc85adc66998637f6999865d891e734561072d8e37b89330943191ab1`
`font_01_sfnt_off0000cd2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD2E	16356 bytes
SHA-256: `fa930faf18a9566473d4b50d8234f7ef7c6024ef2427fce06938af3cfbeae182`
`font_02_sfnt_off0000f6d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6D3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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