PDF malware analysis — malicious · 9dea9b9bdf49b199

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 05:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3038397a3ac51caf564c3304603b221e SHA-1: 3bf9cab76d102e6cf8a74e795c67c7965cc3abd9 SHA-256: 9dea9b9bdf49b19912fd6158809dc684e8bd587b34a48969b54907949526b87f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest the PDF is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=sultan+full+movie+mx+player PDF link annotation
- https://costabravas.com/uploads/localidades/files/76815274835.pdfIn PDF document text
- https://shindah.com/images/ckeditor_img/files/9321115321.pdfIn PDF document text
- http://qapoll.com/2015/vat/upload/files/48880063975.pdfIn PDF document text
- https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/71717045218.pdfIn PDF document text
- http://asid.rw/userfiles/file/vabitowutavew.pdfIn PDF document text
- http://artgrafika.cz/userfiles/file/xazamenuxa.pdfIn PDF document text
- http://radtel-sport.pl/userfiles/file/nonusomewijizej.pdfIn PDF document text
- http://fuyu.010bi.com/ckfinder/userfiles/files/rosusomow.pdfIn PDF document text
- https://dennismaloney.ca/upload/editor/file/fasolut.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6b1750d6---99527904565.pdfIn PDF document text
- https://makiriaszto.hu/ckfinder/userfiles/files/80962904840.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16143530adc3e3---87442500152.pdfIn PDF document text
- http://yugang360.com/upload_fck/file/2021-9-13/20210913234628571642.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/320495e3232334c84da0d9aa5bf86f65/77812790447.pdfIn PDF document text
- https://cmfnepal.org/userfiles/files/busazose.pdfIn PDF document text
- http://hizirferforje.com/admin/fckeditor/editor/images/file/2851396021.pdfIn PDF document text
- http://starroadchina.com/userfiles/file/48857338197.pdfIn PDF document text
- https://polytex.de/sites/default/files/dowojedavuzolorebofovizew.pdfIn PDF document text
- http://technimexvn.com/images/ckeditor/files/72795167529.pdfIn PDF document text
- https://designsdubaiukfashion.com/userfiles/file/webomoz.pdfIn PDF document text
- http://dmkert.hu/files/file/pupazifelewelelix.pdfIn PDF document text
- http://centralgiving.com/media/userfiles/file/wamuleradopolemuvimitasug.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e1a602190---9735574630.pdfIn PDF document text
- https://cnn-logistics.com/asset/files/jumobafederi.pdfIn PDF document text
- http://nextlab-semi.com/files/fckeditor/file/guwexewekiwumatoratupagas.pdfIn PDF document text
- https://cfbadalona.net/ckdata/files/45668672319.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_off0000e214.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE214	10808 bytes
SHA-256: `10e7defa169fff3ee08ced6ff68cb55e6124e8b24ebf11cc4eb138d758a7dbf6`
`font_01_sfnt_off0000fb09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB09	18788 bytes
SHA-256: `a5d7b85594fa94c7e2a97798978addd66c71ef7e77cbd717fef27c0a9c18f8ca`
`font_02_sfnt_off00012c3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C3B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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