PDF malware analysis — malicious · 65712657f788e464

MALICIOUS

PDF

83.8 KB Created: 2021-10-29 05:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 2e99aee72d350d7d4c0b68112fa60758 SHA-1: d6626fbff0fbbe6c2e77289580f02eb0bef17545 SHA-256: 65712657f788e464a7f89c680d614288ec0f65c63d2716143f8d2ed1e9887a60

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
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://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/83380747461.pdf In PDF document text
- http://futsalcb.cz/picture/vtextu/file/dewazobevufajenobumo.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qgqsdasr3jc290legg1gac0hgt/88059675601.pdfIn PDF document text
- http://hosungtour.com/FileData/ckfinder/files/20210907_E621877DA696DEAE.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b1dbf96cf31def546fedec3c76e9d4d5/7883193352.pdfIn PDF document text
- https://penmypoem.com/new/admin/uploadfiles/file/15563854067.pdfIn PDF document text
- https://tungafilm.com/dorceiys/ckfinder/userfiles/files/nurupis.pdfIn PDF document text
- http://handbook.hu/upload/page/file/fevakilap.pdfIn PDF document text
- http://xn--aknmedcal-wpbe.com/uploads/file/77527021941.pdfIn PDF document text
- http://studiotecnicomaglio.it/userfiles/files/wakoxubo.pdfIn PDF document text
- http://risorsaterra.it/userfiles/files/33786007205.pdfIn PDF document text
- https://mariapolis.net/ckfinder/userfiles/files/zikunofazasudubekud.pdfIn PDF document text
- http://avandcie-energy.com/ckfinder/userfiles/files/pogepageveviseraregitefil.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/6g7g18dg7ru6m2f1s0iq6804i2/86350064276.pdfIn PDF document text
- https://barcelonamedicalcenter.com/files/galeria/files/29264234157.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2bcbea6a535a057f03ed18396f5b6864/25371287215.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0ed055c9b43820fff53810e41f297e5b/1091247626.pdfIn PDF document text
- http://cnsgawefgl.netsociality.com/upload/files/powawukarokaxakodaw.pdfIn PDF document text
- http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/96879656179.pdfIn PDF document text
- http://119pump.net/d/files/foxuveko.pdfIn PDF document text
- http://svb-volleyball.de/userfiles/file/60264196856.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615dc40b2c1e8---bopiresole.pdfIn PDF document text
- https://sudhirsachdevaclasses.com/ci/userfiles/files/66964213195.pdfIn PDF document text
- http://juha.be/_files/file/mibikazumezilitawaxoned.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/695710f0d14a5b3c432e97362977c542/xuwasosoturewamariwaxolux.pdfIn PDF document text
- https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=mp3+cutter+for+pc+windows+7PDF 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_off0000df68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF68	18516 bytes
SHA-256: `bc7532bb0f703b78bef31b0fc63c015f173d1661c93e45277fbc691075c0fce1`
`font_01_sfnt_off00011044.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11044	10808 bytes
SHA-256: `d4cfb0d83339fe099f98cbb44bfd142fe3618fa66e9ecc8821af0a5a4bcc6e02`
`font_02_sfnt_off0001297f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1297F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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