PDF malware analysis — malicious · 372fa2a0cb541105

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 04:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 06a18ccf9bb4a98ef72f517bcf656f9d SHA-1: 669cc7b438531d886a682b129181baf0bc1b643a SHA-256: 372fa2a0cb541105969002e69703316bf7e508a98a4e70c0cf7c2bda11b9f8c4

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lead users to potentially harmful content or exploit kits.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 5

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://irlanc.ru/uplcv?utm_term=how+to+download+ibis+paint+x+on+windows+7 PDF link annotation
- http://csc021.com/userfiles/file/20210715141308_w3ab35.pdfIn PDF document text
- http://zovsh.com/Uploadfiles/files/59332978655.pdfIn PDF document text
- http://sosonomo.com/ckfinder/userfiles/files/82241088911.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/467n2b4o4t07negd7rm0lquhu1/pevuwitilirol.pdfIn PDF document text
- http://animalscipublisher.com/files/upfiles/file/49125529507.pdfIn PDF document text
- http://bright-inter.com/file_media/file_image/file/70945357794.pdfIn PDF document text
- http://magendans.com/imagefiles/file/1561495487.pdfIn PDF document text
- http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/8702077830.pdfIn PDF document text
- https://xn--80aggmy8c6c.net/UserFiles/File/xujodosevasuxanodokenaweb.pdfIn PDF document text
- http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/madosakepirudazozes.pdfIn PDF document text
- https://cam-ceeds.org/ckfinder/userfiles/files/81017121510.pdfIn PDF document text
- http://auburn-properties.com/userfiles/files/nubuxisi.pdfIn PDF document text
- http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3051c0da58---14885597920.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61e979778---vuwolerijikakibezuxege.pdfIn PDF document text
- https://glearningsolutions.com/userfiles/files/61983753882.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e336b7e2c6cb1f25dbecb585a3a3d8af/gevumunofefitipilerabewe.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae503200eb---wegefurezeviwugamid.pdfIn PDF document text
- http://2990592.ru/ckfinder/userfiles/files/40849557371.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c0fb1be7---kavijoj.pdfIn PDF document text
- https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/081a8503ad25d9ced81465423e9e758e/35172116147.pdfIn PDF document text
- https://n-zvuk.ru/upload/file/91324985917.pdfIn PDF document text
- http://nirmalapublicschoolerumely.com/userfiles/file/97609405740.pdfIn PDF document text
- https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/565e8c0ad225f1244d197216335f9f50/41453295006.pdfIn PDF document text
- http://klubbelgickychobrov.sk/editor_uploads/files/40037188321.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_off0000f75d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF75D	10524 bytes
SHA-256: `99be8bbdcca8f7711b06a2b97300cf2c225ea6161e4e85fc06dbfd45e0fa7943`
`font_01_sfnt_off00010f3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F3F	17004 bytes
SHA-256: `9963ddd90a7bacd60c3342badfd6d25a8443c02b48f0cf82c83949ddc56d2f22`
`font_02_sfnt_off00013a79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A79	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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