PDF malware analysis — malicious · f980bdefb1535329

MALICIOUS

PDF

108.1 KB Created: 2021-09-01 05:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 06ff580b1170cdc8d0fe7eaa8f2c2b5f SHA-1: 4503104112aa1914ebd263477b172983a0f1074b SHA-256: f980bdefb153532988c8471a95c3db59f1ca68636449c967502ed9022ea328f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains a large number of links pointing to various websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary function of this PDF seems to be to redirect users to potentially malicious content, likely for phishing or to serve further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9509

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://medvor.ru/uplcv?utm_term=introduction+to+computers+lecture+notes+pdf PDF link annotation
- http://prtourusa.com/FileData/ckfinder/files/20210808_3AA185E1EA2696E2.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0948e58f85c8148818d04c9b9a5a9cac/21535852622.pdfIn PDF document text
- http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jofolodulaloxed.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61179b6e5a---jemusuwenegi.pdfIn PDF document text
- http://vattuxaydunghl.com/userfiles/file/sapomegalevozafumub.pdfIn PDF document text
- https://hiperaktivite.info/userfiles/files/45977079490.pdfIn PDF document text
- http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/suzususesafafa.pdfIn PDF document text
- http://sparkpro.lv/content/file/73258183598.pdfIn PDF document text
- https://altinhediyeler.com/calisma2/files/uploads/17665690954.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d43d1d585---94486516189.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/70f0f91eb5711832e018ed565f0f2622/vemovenedogedo.pdfIn PDF document text
- https://iwistw.com/upload/files/radamedogegunilotitesu.pdfIn PDF document text
- http://narcisse.sk/editor_uploads/files/93052362213.pdfIn PDF document text
- https://eco-translation.ca/upload/editor/file/doxemamamomonit.pdfIn PDF document text
- http://ducthanggroup.com/webroot/img/files/soniwulozodep.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/884e2fac027756a3d0f01a73c446ecb2/werofuviloverufurog.pdfIn PDF document text
- http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a18c3520af3---kogixoserezurareguz.pdfIn PDF document text
- https://savitravel.ro/ckfinder/userfiles/files/xadapudomulalijer.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dcda97646---24072045176.pdfIn PDF document text
- http://2018.letnifestiwal.pl/ckfinder/userfiles/files/81866889417.pdfIn PDF document text
- https://investmentskillsgroup.com/images/userfiles/file/vebafuvufaditasagobaroled.pdfIn PDF document text
- https://0800-707-808.com/upload/ckfinder_temp/files/20210808032906.pdfIn PDF document text
- https://noithatkuongthinh.com/uploads/files/3953263449.pdfIn PDF document text
- http://aurora-c.jp/files/files/dazuzibuditurawagixu.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607045570648a---mawutajobu.pdfIn PDF document text
- https://nanyangtextile.com/userfiles/file/kovali.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000124e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124E3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00013cf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CF5	20672 bytes
SHA-256: `a8780d09e7e3de750404994b78e0b9171b216e11aaf9c54507e7e909bc640645`
`font_02_sfnt_off000171f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x171F2	10668 bytes
SHA-256: `3d6d58cecdd8e261b7258e649fe54b489cafc02e316eedeb1780037921d49527`
`font_03_sfnt_off00018a58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18A58	16276 bytes
SHA-256: `d00f1692df822d21e1a5e98ad8b77085329bebac9fa4d66ecc38022986c9330a`

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