PDF malware analysis — malicious · 67bd86c77c8d89ad

MALICIOUS

PDF

96.7 KB Created: 2021-06-25 20:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 55958a7a7a732dd77a32bc49f6955ec9 SHA-1: aa8bd141bc301e21fc7612e96d543a6a4a753a3a SHA-256: 67bd86c77c8d89ad9b8b3492c1c9564cd5358c9efb5395b9962b748a2673a0c3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage redirection scheme likely intended to obscure the final malicious destination, possibly for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9746

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://agnieszkapawlik.com/userfiles/file/88470243035.pdf In PDF document text
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/188e2fd4d152398d85d9c982a748f401/97231742508.pdfIn PDF document text
- https://zionapostolicministries.org/uploads/file/ragesuravazaxuli.pdfIn PDF document text
- https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/68582pii2ubijrm0ouaf733bc3/tifowoko.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608970851fbc6---bazirod.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95053709e3---12061315669.pdfIn PDF document text
- https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c339e6f2e7e---zijoligu.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/kf577dbf4qaln5lt3m8lco5mj2/75798385335.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076608507ca9---fikefemobisarutoxinower.pdfIn PDF document text
- http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/44694841579.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b79913103---95990822061.pdfIn PDF document text
- http://delshadian.com/public/userfiles/file/vajun.pdfIn PDF document text
- http://sskj.pl/userfiles/file/febibutujoviw.pdfIn PDF document text
- http://train-in-japan.com/images/blog//file/bumukawagonezopepumuw.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff0b22041---fakug.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tojmrvi5r1j357iif9jju01iaf/53262487243.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb52c734a6---xupekedulasidapebala.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/odeuj8b7lqoi8flf8b31fm27o7/58211641186.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e44b49693---37102365802.pdfIn PDF document text
- http://pileshoppen.dk/userfiles/file/fejawimavenopamakofo.pdfIn PDF document text
- https://guapa2.com/admin/fck/file/2549509217.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b839e6b650f---jenudujara.pdfIn PDF document text
- https://argumentua.com/i/file/26014758731.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nitomawogukizus.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7ee5ee5frgv04rcho1lco6lrjg/54587226936.pdfIn PDF document text
- http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/goxanapevafedoresubot.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=red+breasted+toucanPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fcaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCAF	4104 bytes
SHA-256: `cf52087fd3b065377998d23224370d502412964b283a44554a368551d8efd01c`
`font_01_sfnt_off00010c7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C7D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001248f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1248F	22508 bytes
SHA-256: `3e7ea9e43f53195c0118cfb7a5c472bda89b34eec775126eb3c2cdd8a0b9dd8b`
`font_03_sfnt_off00015b69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15B69	10512 bytes
SHA-256: `14434916d7f3f4284c0be54348451a0401d97dc11e6ed784885e308269ce9ef7`

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