PDF malware analysis — malicious · f9fb61a3ca605555

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 02:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: e5b7ea878797c54619eb55b69f6b6070 SHA-1: d141730cc53d799edde17af1e66681f7c28f159e SHA-256: f9fb61a3ca605555ac828ab76459387cc238b5d15e9a8566cb7d34742db9e15a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

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.
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 http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/c5bm690i7m959q17db5rd44vf6/99086235757.pdf In PDF document text
- http://evaemlak.com/userfiles/file///79975893027.pdfIn PDF document text
- http://rockbond-aac.com/id-admin/fckImages/file/fekugobog.pdfIn PDF document text
- https://takitech.hu/userfiles/file/74862736740.pdfIn PDF document text
- http://sun-tes.ru/files/file/fabamagobizipuwapo.pdfIn PDF document text
- http://airconbank.com/upload/fckeditor/file/43805350213.pdfIn PDF document text
- http://spbmedaks.ru/sites/default/files/uploads/16786628725.pdfIn PDF document text
- https://dukeofmarshall.com/ckfinder/userfiles/files/43926682914.pdfIn PDF document text
- http://axwelindia.com/uploads/lafaxebiwegu.pdfIn PDF document text
- http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48436674019.pdfIn PDF document text
- http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906194946.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6df15f81d44175c90fee8929a3b2c56c/bomikejo.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903031406841675.pdfIn PDF document text
- http://potlista.com/file/files/lelimamuveteselexafali.pdfIn PDF document text
- http://kadh.kr/bobod/upload/file/2681161218.pdfIn PDF document text
- http://resortvillairene.it/userfiles/files/tokoxetedizolowal.pdfIn PDF document text
- https://konferencii.ru/js/ckfinder/userfiles/files/fexovawu.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f2a8447b---23076260679.pdfIn PDF document text
- http://itcbeautytrainingschool.com/userfiles/file/kezusotokipe.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7ee327a34e208646cacb1be32af10c1a/pujitikorukuxaputupef.pdfIn PDF document text
- https://www.jdconstinc.com/ckfinder/userfiles/files/83324110604.pdfIn PDF document text
- https://vsevolozhsk.mebel18.com/uploads/files/movadez.pdfIn PDF document text
- https://hglobaltourb2c.com/FileData/ckfinder/files/20210909_BD663A82BC2AFC6E.pdfIn PDF document text
- http://factorycontrolprojects.com/userfiles/file/67506410725.pdfIn PDF document text
- https://dialogueinpraxis.net/files/docs/lumuluvawipuz.pdfIn PDF document text
- http://pnlestari.com/visitbali/image/files/79063654170.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=80+days+around+the+world+book+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_off0000db75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB75	17828 bytes
SHA-256: `f9844198f2eeeb081b99c808376daaa68a93da1285aa8341078d4f51394b5444`
`font_01_sfnt_off000109b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109B6	11268 bytes
SHA-256: `ca3ac56b59a74ca3092cf5e85f6ef753fe656aa0049e60004ae6ba9372590952`
`font_02_sfnt_off000123f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123F7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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