PDF malware analysis — malicious · 6831ac2611f6e407

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 02:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 40692b68e2fdf0a1e5fca99d713e801f SHA-1: a70f7f6d1f236d834e02073844d199c80e929d59 SHA-256: 6831ac2611f6e407a73693f9e7e618db71849e2493199ecf01c3f24d76a343b1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress installations. The primary function seems to be directing users to external sites, potentially for phishing or malware distribution. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9986

Heuristics 5

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://inwebjor.ru/uplcv?utm_term=watch+my+hero+academia+dub+free PDF link annotation
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161438893a01f5---43110366591.pdfIn PDF document text
- http://viprealestatebrokers.com/userfiles/files/baxabaxixekepabed.pdfIn PDF document text
- http://shesob.com/file/files/bamowotimamoxijidikifefa.pdfIn PDF document text
- http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/tepefasegef.pdfIn PDF document text
- https://coffotea.com/uploads/files/202109160301007584.pdfIn PDF document text
- http://cerrutistudio.eu/userfiles/files/sitotaxetov.pdfIn PDF document text
- http://cserepakcio.hu/xdata/file/vorarepozodipixa.pdfIn PDF document text
- http://bannermaul.com/userData/board/file/2349583981.pdfIn PDF document text
- http://dison.cn/filespath/files/20210909024948.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4bb263f4d3cfe545575170f7cffbc57b/temapowasujipomufo.pdfIn PDF document text
- http://anipetkingdom.com/webroot/img/files/77410654735.pdfIn PDF document text
- http://wmsone.com/eimages/file/14897001010.pdfIn PDF document text
- http://hifitness.hu/userfiles/file/65336806624.pdfIn PDF document text
- http://retrolondontees.com/userfiles/file/javewosinojewanogo.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2hbbjtga7lj32fp16mqlj0lbg7/68506304004.pdfIn PDF document text
- https://dangeloremodeling.com/nbloom/fckuploads/file/nedoz.pdfIn PDF document text
- http://tatagz.com/uploadfile/files/kurawavupugiperiju.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/869915dd5f0a3cbf16f0abad7fe4f559/sukik.pdfIn PDF document text
- http://shceping.com/upFile/photos/2021-9/file/50868961647.pdfIn PDF document text
- https://cplastik.net/data/cms/file/57292789439.pdfIn PDF document text
- https://mountmoriahcamp.com/media/lazagez.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_off0000b574.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB574	16084 bytes
SHA-256: `a591efa0bf2b335361272dba20cfcd56cfb36b74144a83d23f92de3f7bb9da94`
`font_01_sfnt_off0000deab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEAB	10768 bytes
SHA-256: `9cc46f887add1f7be006e1fe67942fff6ad0893a253d82e75b6bf4c6255c58eb`
`font_02_sfnt_off0000f781.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF781	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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