PDF malware analysis — malicious · 381da51220624335

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 09:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 16e3ff2770055bc0ccc2e282f132cddd SHA-1: 1e577e7d6792bf49c4daa45b66ab3f09f1fac1ee SHA-256: 381da51220624335a27c8699d4ec49029027ab4837d39764e7fd8514d2e21786

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate it's used as a lure, likely for phishing or to download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=naea+conference+2019 PDF link annotation
- http://gayaarchi.com/userfiles/file/20210622154723.pdfIn PDF document text
- https://menuiserie-sainte-anne.fr/userfiles/file/geneziwodu.pdfIn PDF document text
- https://wecareprogram.org/images/file/50978461927.pdfIn PDF document text
- http://studioingtassinari.eu/userfiles/files/befozejeravejusirovu.pdfIn PDF document text
- http://familiehollander.nl/images/uploadedimages/file/9444488354.pdfIn PDF document text
- http://bloemenwinkelindex.nl/images/uploads/nodupe.pdfIn PDF document text
- http://villapellegrino.it/userfiles/files/87059694196.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5e83b0c348b988a863e16d188154e868/kexivabefamajetaw.pdfIn PDF document text
- http://mikomisushiwc.com/uploads/files/fufexozobuvo.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/55u2d89mt5vba2o0ror6agrph1/tenajiv.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc828774c1---vapoga.pdfIn PDF document text
- http://atya.eu/files/file/gudodesajepiwulewutozu.pdfIn PDF document text
- https://lostfoundglobal.com/userfiles/file/34486153447.pdfIn PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2028cee464---33936415618.pdfIn PDF document text
- http://rauvuonsach.net/images/uploads/files/forozoke.pdfIn PDF document text
- https://leo.tw/upload/ckeditor/files/pibubumowizudam.pdfIn PDF document text
- https://eetravel.net/file/21671524321.pdfIn PDF document text
- http://vertracapital.com/uploads/files/87455909860.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f74d29e71be014e740fbb2132e5fe2db/godikuxo.pdfIn PDF document text
- http://abogarestudio.com/userfiles/file/47298689027.pdfIn PDF document text
- http://poongdung.com/FileData/ckfinder/files/20210704_3F81494D59A94670.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2cf601ad---gewolonab.pdfIn PDF document text
- https://wildnaturetravel.com/File/12152496937.pdfIn PDF document text
- https://vico-real-estate.com/ckfinder/userfiles/files/31285978720.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_off0000e878.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE878	18060 bytes
SHA-256: `f145ab0ba3882aa38c13d97610a94fd20795e0b43e41b226c7f7a245f9ceb9c1`
`font_01_sfnt_off000117be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117BE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012fd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FD5	10364 bytes
SHA-256: `fdb24383632ca89580e4a4b1801038f2e7569285a55fc5565627686687ea4544`

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