PDF malware analysis — malicious · cb6b52246ba6798a

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 08:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: f3bceaa1f3e36d9256ddc6fde9e01fd8 SHA-1: 89d168404ec23b079e17f1aeefe29da0bef7be36 SHA-256: cb6b52246ba6798a17c7e40f580ce5bf26f0fd8158908cec5ae87bfadfa34c1e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=my+phone+keeps+closing+apps PDF link annotation
- https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/33986601643.pdfIn PDF document text
- https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/dozepewafanumikakugujigez.pdfIn PDF document text
- https://limsurempat.com/contents/files/kufafasuzoratevaguka.pdfIn PDF document text
- http://tubemakingmachine.com/uploadfile/files/kafukulokejamawe.pdfIn PDF document text
- http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamupeluvumolaf.pdfIn PDF document text
- http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133372c6cd2f---14893163740.pdfIn PDF document text
- http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95347887239.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/5e0393f5aef1511d3ba7f8056cadf137/sonobepenoxuwofeliben.pdfIn PDF document text
- https://susta.vn/userfiles/file/zabedabajugujesipe.pdfIn PDF document text
- http://computerdoki.hu/user/file/lapumikiwewowevibadavu.pdfIn PDF document text
- https://brihat-group.com/assets/userfiles/files/bibejozutilixa.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132234d03775---8743283841.pdfIn PDF document text
- http://ecohouse-lab.de/userfiles/file/8824273502.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502c6766f7---61699640441.pdfIn PDF document text
- http://madmojo.com/fckupload/file/jikoxupepatuvupidugub.pdfIn PDF document text
- https://coopinproject.eu/ckfinder/userfiles/files/mixazenafulurabitavose.pdfIn PDF document text
- https://almentispharma.com/ckfinder/userfiles/files/61656467208.pdfIn PDF document text
- http://sibstroiexp.ru/userfiles/file/4043732170.pdfIn PDF document text
- http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/tonopuze.pdfIn PDF document text
- http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/85969052975.pdfIn PDF document text
- https://408of53crownstreet.com/assets/media/files/15356606798.pdfIn PDF document text
- https://rubyyadav.com/nbloom/fckuploads/file/mujelabikinunafumokafi.pdfIn PDF document text
- http://fskyok.com/uploadfile/files/wiviruzojolozub.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/46c3d7eda2346883ff71c7b85c74fdd3/57511571638.pdfIn PDF document text
- https://tarsiman.ee/files/file/52776806736.pdfIn PDF document text
- http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/63273027266.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_off0000dc7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC7C	17488 bytes
SHA-256: `025d32d44bd197ccd26f7245a4f65b282f112391d1027cc555fd28cc87ff7bcf`
`font_01_sfnt_off00010967.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10967	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001217e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1217E	10656 bytes
SHA-256: `0d4633573ca91cdf2cc4f25ccb516066c9c7f452c4e980b337b53dd199b51635`

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