PDF malware analysis — malicious · 9d5439fa68d17830

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 16:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e8ad81eb209a717e8922a2130ce2c43c SHA-1: f88bc9ce992111f9d4c564e803a121e726a5b72e SHA-256: 9d5439fa68d17830e68a5133da0ce3c5332fbf0a31b6fd78d277b02602235b4e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF acts as a lure to external malicious sites.

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://crysiq.ru/uplcv?utm_term=kista+coklat+adalah+pdf PDF link annotation
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7076f7bf---pesimorexerupizomitam.pdfIn PDF document text
- https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/podipalevanapepemir.pdfIn PDF document text
- https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c2b61035f5d37c712cc9167c91f0f58c/22367950748.pdfIn PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8570fbc898---2984090332.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df2e4f2eff---kunanoxavizovodobet.pdfIn PDF document text
- https://pk-kuepfer.ch/ckfinder/userfiles/files/sebenetokazofidomam.pdfIn PDF document text
- https://dermatologie-chamonix.com/userfiles/file/4944315385.pdfIn PDF document text
- http://clair-environnement.eu/catalogue_dynamique/file/zokavezoguwugaxaruzoj.pdfIn PDF document text
- http://solis.altrodesign.eu/ckfinder/userfiles/files/nulepale.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a461eb71b3cb5519e7a6089a85c49332/bozupopelizazugefotepakaz.pdfIn PDF document text
- http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de39c0e30ba---xenasap.pdfIn PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a25c395c4da4e728d0885d96066d74d6/97036311176.pdfIn PDF document text
- https://network-italia.it/file/zosezijerumonoriruzasoguv.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e18410c0d---41463068348.pdfIn PDF document text
- http://swaminarayangm.org/userfiles/file/78744933117.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e52ab6c59---48812109818.pdfIn PDF document text
- http://geostudio.eu/userfiles/files/12362998789.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a2abd4af---22273272807.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e6jdr3r7lnmt2eg9f3dbvdihce/pewurumupawipimadewoz.pdfIn PDF document text
- http://interwork.sk/userfiles/file/kizabi.pdfIn PDF document text
- https://rainbowprinter.com/app/webroot/files/file/14208380114.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805b87f3cca---91987013388.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b70fd99193e6b48f801992bae1900fdb/47427141563.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/40049b08f65381cb92aa3e98db183181/gobexuxelisawedubepu.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b62fcddb7a6---20826072884.pdfIn PDF document text
- http://ptichile.cl/userfiles/file/65628432216.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_off0000e018.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE018	10464 bytes
SHA-256: `e92b24a54a1057f7049a08b5eb3d8e70749940d51a921cc09dbb5be46c6f88b9`
`font_01_sfnt_off0000f7fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7FA	16204 bytes
SHA-256: `fe7fc76b4cd55680a2fdf74d1e3e98e9d84719f6232f9c2a1264fcefe4d7cd52`
`font_02_sfnt_off000121d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121D9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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