PDF malware analysis — malicious · 99de135b490b0e53

MALICIOUS

PDF

86.1 KB Created: 2021-08-08 02:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c561f5fa0b1d16dc3a968fe61ea4d2b7 SHA-1: 2cd484e5f713494f4d939d57d0290c8092dbfdcd SHA-256: 99de135b490b0e534c941506e7537742a3683f9ea30f670d536aa3b499fa9e30

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file 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 distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=australia+address+format PDF link annotation
- http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/36500664154.pdfIn PDF document text
- http://veraschwemmle.de/fckdata/file/miwudoxokobitasorujapofa.pdfIn PDF document text
- http://1975geegees.com/clients/78603/File/93526403106.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9059531cc5e68164f545b976b2f75212/teworobuvawo.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/niotl48t7i42gqeq93luohe4no/feremasaful.pdfIn PDF document text
- http://izeninfo.net/admin/upload/files/24706785890.pdfIn PDF document text
- http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64380569195.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xulujumoze.pdfIn PDF document text
- http://ajtoablakcentrum.com/_user/file/92624587446.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a72817795ebdebd1fcae4c78c8a6ff00/bedozaninanabazon.pdfIn PDF document text
- https://juvelyrikoscentras.lt/Files/file/tuziditubalabiwozig.pdfIn PDF document text
- http://adaviestransportltd.com/userfiles/file/lewusokoroladaperedefibif.pdfIn PDF document text
- http://alumcity.ru/userfiles/file/78533507658.pdfIn PDF document text
- http://ahsaipu.com/v15/Upload/file/20215775181984.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bfa542641bcdee00d03ae7f31dface94/tejemexilur.pdfIn PDF document text
- http://leebyunghun.org/new/upload/board/files/gitofomav.pdfIn PDF document text
- https://successstudio.net/userfiles/file/75245450023.pdfIn PDF document text
- http://gallery4walls.com/upload/editer/file/fopokurisewabegepoz.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa97e8c62a---35199639083.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/768f6d80161654ed33f28e50fad4adbb/nisanivapejup.pdfIn PDF document text
- http://zhxndl.com/uploadfiles/files/10311613494.pdfIn PDF document text
- http://mutitar.com/user_img/files/60575247882.pdfIn PDF document text
- https://jxloanchien.com/style/postimage/file/zosuzixeduloweses.pdfIn PDF document text
- http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/20368577506.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_off0000e9dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9DD	10492 bytes
SHA-256: `f31bb4239b3977d9235bc540fd9f7bc2121caa1072ea3bcd84ea20c257e8bb8a`
`font_01_sfnt_off000101c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101C0	19336 bytes
SHA-256: `80f100678d53758e47949ebb5b459978de1fc0afb43bceef6e8bbf75738e6340`
`font_02_sfnt_off000132c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132C2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.