PDF malware analysis — malicious · 916aed5f3e95e6af

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 19:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 4896d6d3ecf929fcf24a9bc5ba6a1ffa SHA-1: e57d36c35310146eaad4175f3fe6410590110e16 SHA-256: 916aed5f3e95e6af99f6aeae73862b0408919d5ad89f79333c48baae6142205e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, many pointing to disposable hosting or compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware download pages. The presence of embedded JavaScript further supports the malicious nature, likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://synerhu.ru/uplcv?utm_term=convert+ppt+to+pdf+android PDF link annotation
- http://ciaooo.ru/uploades/userfiles/file/zitabedizanuxelijaluv.pdfIn PDF document text
- http://mindentudor.hu/userfiles/file/wixoboligawizeb.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a6998854d---80316394951.pdfIn PDF document text
- http://zuche0551.com/upload/file/7935984470.pdfIn PDF document text
- https://keiba-like.biz/js/ckfinder/userfiles/files/48170150489.pdfIn PDF document text
- https://tecnicadovolante.com/images/file/lijek.pdfIn PDF document text
- https://agrimal.pl/userfiles/file/nizoxorepuzu.pdfIn PDF document text
- https://kalimati.in/userfiles/file/gelukok.pdfIn PDF document text
- https://kotypsy.pl/ckfinder/userfiles/files/jifokasedew.pdfIn PDF document text
- http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7e2590ff---63170441259.pdfIn PDF document text
- https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/25007039522.pdfIn PDF document text
- http://senseoftourism.dk/userfiles/file/xonasozot.pdfIn PDF document text
- http://textingrights.com/userfiles/files/sewopujozebesuti.pdfIn PDF document text
- https://wtmasonry.com/ckfinder/userfiles/files/36595680855.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c60b371ad833e683a5b132b245f229f2/77684485236.pdfIn PDF document text
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ae9aa5e1ff365068d9326ec28df93ec/datojiguzoxuti.pdfIn PDF document text
- http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/44967382921.pdfIn PDF document text
- https://braindevelopmentmaps.org/userfiles/files/jufomimikalutez.pdfIn PDF document text
- https://biographiewerkstatt-singer.de/userfiles/file/77555842502.pdfIn PDF document text
- http://marasintl.com/public/ckfinderuploads/files/gagasufojelepudilamoku.pdfIn PDF document text
- http://salukool.ee/upload/userfiles/file/51780991580.pdfIn PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5f5b1f085bfb3425517f0ad557682773/gurumapezobejanulojedosu.pdfIn PDF document text
- http://studioarchterreni.it/userfiles/files/94007562922.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_off0000de0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE0D	17596 bytes
SHA-256: `e41ccc3c56256526c9656ca8f7732b958d9a85db1a4176ba9b2f953c0f129f00`
`font_01_sfnt_off00010ae7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AE7	10376 bytes
SHA-256: `de8581ec23c10e7a33f2da7e34e3b0552d7b63a55b80ade50b00684338e0fd21`
`font_02_sfnt_off00012286.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12286	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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