PDF malware analysis — malicious · 8aac4d83124c40ca

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 09:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 7df9353b783b92eee4ebae9b500d4447 SHA-1: fc18db0fde5a52e60ec30d21a869b8499d2c946e SHA-256: 8aac4d83124c40ca03aea5625682ee1c7012629fde5c05f5c2e82dc7a31fa738

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://adria-ex.com/images/blog//file/237006401.pdf In PDF document text
- http://efrex.cz/files/file/25455711005.pdfIn PDF document text
- http://dexgerm.com/data/file/userfiles/files/843189712.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa203c45dd---23264006939.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844306b7e84---gozokenuxivuridokim.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f1l5tvua409doov32s352ogc97/8267647152.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/587b378512e862ba2d2fab6156a154fa/veruvifotazufebomenir.pdfIn PDF document text
- https://yomadesign.com/userfiles/Proj_Name//files/lonekekeg.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5cd0717dc83fbde45c07273d3bafdcb9/pufibifofijofuzo.pdfIn PDF document text
- https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/nf40so8vpu2qv2iee0krj45h32/puzepefemufi.pdfIn PDF document text
- http://hillsdalehorseboarding.com/ckfinder/userfiles/files/zibutexitikugizosa.pdfIn PDF document text
- http://sdv.sk/userfiles/articles/file/85004431721.pdfIn PDF document text
- http://dblbtech.com/userfiles/file/zogiwe.pdfIn PDF document text
- http://artattack-concerts.de/files/file/72121730752.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161255cf19b462---2851902387.pdfIn PDF document text
- http://kistours.hu/userfiles/file/lezajolitimadire.pdfIn PDF document text
- https://brahmagnanam.org/fck_uploads/file/sejobe.pdfIn PDF document text
- http://quangcaovuanh.com/vietkiendo/upload/file/tozibudalimisak.pdfIn PDF document text
- http://cx-gl.hu/images/files/mejowojotitikufaroxa.pdfIn PDF document text
- http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160949f979688a---pejokajogunimuxotaxeda.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b70290c2c0---wugikafukozigakepig.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf8517834---41262943126.pdfIn PDF document text
- https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ranmhoe7mbrmhdk24qra903fg2/lenoxuzedikazera.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be1b03b56a1---64539390073.pdfIn PDF document text
- http://ceramicaartisticamarsalese.it/userfiles/files/gezukuzolulidiw.pdfIn PDF document text
- https://areicon.com/images/file/59639538576.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=inference+passages+worksheetsPDF link annotation
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3e45638472d790e53678a19237bb97be/59339001265.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_off0000cfbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFBC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e7d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7D3	10748 bytes
SHA-256: `1a1f26d650b9f0e47e650955a0c059d51ebb64dff1b22ebeae8615661c08f23f`
`font_02_sfnt_off0001009d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1009D	16688 bytes
SHA-256: `ce2e0b03b62d866ed65058dce837bd146d8227dd3125f64aab597e72f1c88057`

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