PDF malware analysis — malicious · 9f9c07f1c7740e6b

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 13:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 8c1e4b180d3771eb6abe0e20f0d53455 SHA-1: c3e99b073ccc477ce8858f1e6a3f9f857732335b SHA-256: 9f9c07f1c7740e6ba66d716025bcff9d3dd91f26a788e4e932026b5fb8529abc

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://tkhomedeco.com/assets/uploads/ckedit/files/20210904000222.pdf In PDF document text
- https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/12798323320.pdfIn PDF document text
- http://855solution.com/htdocs/cljr/data/files/pazatujixifidenuzuzugeroz.pdfIn PDF document text
- http://ovstav.cz/app/webroot/files/files/57520229282.pdfIn PDF document text
- http://reklamavysocina.cz/UserFiles/File/kixifekujeboliwekanegore.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161523e33624a1---84276056060.pdfIn PDF document text
- https://istruttorecinofilo.it/userfiles/file/89944832403.pdfIn PDF document text
- http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xegegu.pdfIn PDF document text
- https://wcfkenzi.com/ckfinder/userfiles/files/75285676120.pdfIn PDF document text
- https://www.colline-eternelle.com/ckfinder/userfiles/files/badoxuxetimizifo.pdfIn PDF document text
- http://hosteleriayvending.com/ckfinder/userfiles/files/diwigitafile.pdfIn PDF document text
- https://www.sudoku-cool.com/ckfinder/userfiles/files/2529792991.pdfIn PDF document text
- https://www.passion-rnd.com/upfile/files/2021/09/03/katelanivigumoli.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee6b88c686---62234906595.pdfIn PDF document text
- http://ks-system.co.uk/ckfinder/userfiles/files/zobinotil.pdfIn PDF document text
- http://studiotipaldo.com/userfiles/files/dusikesanevab.pdfIn PDF document text
- http://gaushalango.com/uploaded_files/userfiles/files/65873002424.pdfIn PDF document text
- http://hyunbulsa.org/~ewedd2/userfiles/file/57895696192.pdfIn PDF document text
- http://stopguepes72.fr/userfiles/file/60724244683.pdfIn PDF document text
- https://www.sterlingsez.com/ckfinder/userfiles/files/fufedezegijutokuwufuxewe.pdfIn PDF document text
- http://mylodge-naoshima.com/images/blog/file/57625566455.pdfIn PDF document text
- https://stmarys-perthamboy.com/upload/File/nezoripod.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/aqp3g5f6a5vhtnmdle0827ig27/wapenenakodojebalagajifep.pdfIn PDF document text
- https://sudhirsachdevaclasses.com/ci/userfiles/files/92962047237.pdfIn PDF document text
- https://silatur.com/js/ckfinder/userfiles/files/linelejomiwofaxova.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=medium+difficulty+quiz+with+answersPDF 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_off0000b40a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB40A	11120 bytes
SHA-256: `c60d29c2b611fc1e0aefb8564e7558a221f1065777fd4f38e68b8b757f5fb696`
`font_01_sfnt_off0000cdaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDAF	15648 bytes
SHA-256: `96ab79ff2669067f10eb4e6d8ebe3356a6380a3b3afddef42e2ef02e3633f3ff`
`font_02_sfnt_off0000f53b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF53B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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