PDF malware analysis — malicious · 5724758b329e87df

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 06:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6b9e4c4d1fc83bcea325e9d286f4f2fa SHA-1: 24fe3970e29810246193f4733dc94fdf5a677b1b SHA-256: 5724758b329e87df79ae577fc138b93e97c8d0bd0571914d7f994dfa2ca587a8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. It contains a link farm pointing to numerous external URLs, some hosted on compromised CMS upload storage, suggesting an effort to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

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://solucionaesp.com/ckfinder/userfiles/files/44636143930.pdf In PDF document text
- http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/nukemuxivoximixuwuvikotiv.pdfIn PDF document text
- http://china-zzld.com/uploadfile/file///2021062502203849.pdfIn PDF document text
- http://americandeliorder.com/uploads/files/33950724131.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c612fb733d4---48914224458.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071353f05c14---96302968776.pdfIn PDF document text
- http://vkts.se/userfiles/file/27072010822.pdfIn PDF document text
- http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ufsoc5rtao9uj1u0psoa9n5ah/mupitilazopinijepubumo.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161139f8e261a1---47419802570.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f3a9a64095---xuvonumaludelagegi.pdfIn PDF document text
- https://wineuniverse.us/userfiles/file/bulopenotenovusa.pdfIn PDF document text
- http://thegroverestaurantnj.com/userfiles/files/11157392554.pdfIn PDF document text
- http://www.elmundodelapiscina.com/ckfinder/userfiles/files/28836373275.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c677bc62---88343038175.pdfIn PDF document text
- http://futurepoolandspa.com/ckfinder/userfiles/files/medopizesabitejonijewo.pdfIn PDF document text
- http://studiobaliva.eu/userfiles/files/2422455035.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8d44d502250cd1e8ce5070471399fa9d/4562540431.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9miqtgd9hinh72jv5h3gimhvhl/99393214010.pdfIn PDF document text
- https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/38756f7a262f6682e0943a4dc146b007/36878189499.pdfIn PDF document text
- http://aven.su/userfiles/file/vuwopulili.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/183bae94115b2658819b4a5890470197/xibapoxona.pdfIn PDF document text
- https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/c6rh1v1cvravfl4f76ngmle3aa/18611655243.pdfIn PDF document text
- https://melz-feu.ru/upload/wuzopakegudedewis.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099f5daa75bb---56317869637.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc5a53cff---duniriborerogajugapusaj.pdfIn PDF document text
- http://baodieptailor.com/uploads/2021-08-09/images/files/noxuvi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=handwriting+improvement+worksheets+pdfPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dd24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD24	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f53b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF53B	11136 bytes
SHA-256: `bb300c9123cd97caec50e21b0d06aa831c2a84c776d047e2a8d6f69efcc62a45`
`font_02_sfnt_off00010ed5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ED5	17844 bytes
SHA-256: `148e37382fd869bce523652b0c22c510caee7cdcc1f3bd3e1f8e43056f8c2a75`

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