PDF malware analysis — malicious · 04399e575b4c8214

MALICIOUS

PDF

103.9 KB Created: 2021-06-29 09:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 53a0f2d058c3efa064443d08ff348195 SHA-1: bc883776f78cd9f91732b771cf19049ff4a9ef6e SHA-256: 04399e575b4c8214f0f48648044086403e546229241c549ffdca17ee9d84ca8e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, likely involving exploitation of PDF vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9773

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://oniceh.ru/uplcv?utm_term=another+word+for+bad+relationship PDF link annotation
- http://best-infosystems.com/userfiles/file/zafulidagosugilevu.pdfIn PDF document text
- https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ec75dce05231fcd7275c92fb61588de5/68031056416.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/70000f5477b4ba23524838c280bd2465/sekaxabatomejo.pdfIn PDF document text
- http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/galeritigasurezo.pdfIn PDF document text
- http://rajhansnursery.com/userfiles/file/69427155858.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820e33e6b64---wekesabedepomowa.pdfIn PDF document text
- http://branpc.in/ckfinder/userfiles/files/53646476421.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/335d1289a5967193179927847557db44/gizugug.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5iu6v50163sfdg3p7cbbt33575/japoxij.pdfIn PDF document text
- https://ajwatravel.com/wheelmarine/userfiles/file/61268456973.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610469fadc---gesaleb.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a289c11ff1c---boravukedukito.pdfIn PDF document text
- http://jarosi.hu/files/file/65385863245.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825bc3e07c---85907044549.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/64c9b41c76f12341a0f6d15a679cbfcd/kupiroderuxeme.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/tngs2utn7mermur3be41lplc4u/65786285987.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076625743da5---lamubigurabobal.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe9facc0f---39787816056.pdfIn PDF document text
- http://altinay-law.com/images/file/taxuk.pdfIn PDF document text
- https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/b321687ecdb5134d9ee1c1e5815bf3dc/bexexiv.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab6ad7a8bf---xixanogur.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/65531af9569eca1214eed818d9b36310/dufinenativ.pdfIn PDF document text
- http://etabetasurvey.com/userfiles/files/59491172975.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e64e189671---zidikejejim.pdfIn PDF document text
- http://shopcloud.cloud//ckfinder/userfiles/files/24744185081.pdfIn PDF document text
- http://artecgroupservices.com/imagenes/file/ritalesanirutuxisuvuzude.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b137a414314---62545981968.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_off00013402.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13402	17432 bytes
SHA-256: `68d42b85e2aeebcb5ebad4500761df165a962c4b6ced806c641fd08fc289af8f`
`font_01_sfnt_off0001615f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1615F	10804 bytes
SHA-256: `f819e9e7d409201ba418edea7162210647917f2354725ca86828aee5de615506`
`font_02_sfnt_off00017a0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17A0E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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