PDF malware analysis — malicious · b16649f6e1c9f328

MALICIOUS

PDF

88.4 KB Created: 2021-08-25 11:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: d4b86d47ce9f802525a887eced4dd729 SHA-1: 77fab32d465642e4db15b0aeb17cd1d59737e149 SHA-256: b16649f6e1c9f328c0ab27a415d44e28bb82d59d1defab752c2e60c03b38690f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL analysis point towards a malicious document designed to lure users to external, potentially compromised, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9738

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://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/c176bfb5e709421142582c663188cd92/woxawejisuzobaginamize.pdf In PDF document text
- https://syntellect.ru/Repository/file/xitiwanazizofa.pdfIn PDF document text
- https://agrimal.pl/userfiles/file/gokatexowuzeliweketuj.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d6cff06d4---50831563445.pdfIn PDF document text
- http://oaklandscreche.ie/userfiles/files/lofup.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/du7f50rgk78pko10fpauereh1b/24981560669.pdfIn PDF document text
- http://bukharasuwanee.com/sites/default/files/file/19634035257.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d433c1ed---77014706411.pdfIn PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/21poaj5t7g9ivvis786p5pprv0/kaxezojo.pdfIn PDF document text
- http://grupopiscis.com/upload/files/52561568847.pdfIn PDF document text
- http://www.grifin.sk/files/texoxogutekakitogeriniw.pdfIn PDF document text
- https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/23a02456baaf1e6396d0269b97f52daa/91649505028.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1d5rqrrsmr4b6ir9ti27i4tfe4/41491543117.pdfIn PDF document text
- https://cleartunemonitors.com/ckfinder/userfiles/files/guxema.pdfIn PDF document text
- http://bomtvcloud.com/data/board/file/20210513003352.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/br57o3rbve53i1efuldf2c8muv/jugaruvitomusudizugox.pdfIn PDF document text
- http://thingsantiquesla.com/userfiles/files/rukoguvetozano.pdfIn PDF document text
- http://christopherspubandgrille.com/userfiles/files/kubifudadirujubuvobatuto.pdfIn PDF document text
- https://angkorphotographyguide.com/userfiles/file/46071244737.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/denunatiweturewedepix.pdfIn PDF document text
- http://getem.plfiles/file/19651237894.pdfIn PDF document text
- https://uclerbaklava.com/resources/file/zujiboxananekefulim.pdfIn PDF document text
- https://alatheir.com/atheirwsfiles/file/mukixevunujova.pdfIn PDF document text
- http://dalnoboy.net/data/filestorage/upload/files/87362644027.pdfIn PDF document text
- https://www.carrentchiengmai.com/files/32178652038.pdfIn PDF document text
- http://qwerty.pl/_data/file/12854856560.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d283af6a8---rogisolufoput.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=just+say+soPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e6ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6BA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fec7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEC7	2584 bytes
SHA-256: `69d1af858c5f80c85041ef4fe9ef6961975eb6a3283ba7d23253061477736eb1`
`font_02_sfnt_off000109c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109C3	9832 bytes
SHA-256: `807a340403c8d3d893f823bf22a51a153113dc5b17b1892a53ef28b1d46d2073`
`font_03_sfnt_off00011f93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F93	19220 bytes
SHA-256: `62217a087ad71dd9e3a19c71211a1301c2d6f9073c29878a003c1eb796d99421`

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