PDF malware analysis — malicious · 77fc1b7832946958

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 23:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 20ce937ba27629aea29480b348e4c8c5 SHA-1: 68c7b6f2cc08816b257b72d44fc474285318332f SHA-256: 77fc1b7832946958b52060e7532b749f90815dc46708d2403d057b4932f68522

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content. The presence of a specific lure related to 'samsung galaxy usb driver download' indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=samsung+galaxy+usb+driver+download PDF link annotation
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb8fb16d05---rajisoduzikagub.pdfIn PDF document text
- http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/34446321381.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29165060d---kovijosuregunidel.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ee3a1f3389214317d376244e64377255/jupamidagaledoj.pdfIn PDF document text
- https://divanich96.ru/admin/ckfinder/userfiles/files/9456631316.pdfIn PDF document text
- http://fittbikese.hu/files/file/puvarosupamanino.pdfIn PDF document text
- https://lenaoyunlar.com/calisma2/files/uploads/buxusomedotikofawugober.pdfIn PDF document text
- https://abouelhoulgroup.com/userfiles/files/kewakurajezotekukivodud.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/34da8e2e00a61fb9f48536e6ba47daa9/61991024306.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161422649316b2---tavasojopogonebit.pdfIn PDF document text
- http://abwcrainhwy.com/uploads/files/baritotal.pdfIn PDF document text
- http://xn----7sbev0bhje.xn--p1ai/images/news/file/dubufo.pdfIn PDF document text
- https://araprinter.com/ckfinder/userfiles/files/gubuzuradiga.pdfIn PDF document text
- http://net-marketing.hu/images/files/63408149906.pdfIn PDF document text
- http://modulobase.com/userfiles/file/37841577636.pdfIn PDF document text
- https://betamachinery.sa/other_files/File/9894429128.pdfIn PDF document text
- http://veraschwemmle.de/fckdata/file/40381668630.pdfIn PDF document text
- http://kxqcgs.net/filespath/files/20210905014836.pdfIn PDF document text
- http://salocchi.it/userfiles/files/63560879209.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4579bcad49ec123759d8db9697eb2042/lubesopewazewawutiwomo.pdfIn PDF document text
- http://zkmeiqi.com/admin/ckfinder/upfile/files/rupinexebo.pdfIn PDF document text
- http://kxqcgs.net/filespath/files/20210905183713.pdfIn PDF document text
- http://workontext.ru/media/file/41147292792.pdfIn PDF document text
- http://xinchenfast.com/upload/file/zisufumuzom.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a4e4e2fd---41276037843.pdfIn PDF document text
- https://sahyadrisevasanstha.in/userfiles/file/makorobubate.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_off0000d1ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1ED	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ea04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA04	11176 bytes
SHA-256: `e4b87711bb92a4443b871f827bb851f9462544537a0df848e992e5632a436f00`
`font_02_sfnt_off000103ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103EC	16876 bytes
SHA-256: `c9040062b64f8fe102063fee089ad340f7d9e69e70742795207ff9df4c22e7ba`

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