PDF malware analysis — malicious · e829fb49c1c16937

MALICIOUS

PDF

89.9 KB Created: 2021-09-01 16:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 2c648d4d9830cbcb40407646e5bf3370 SHA-1: 0d5cfa823773801d2342dae1da0ec94debc718e5 SHA-256: e829fb49c1c1693712e30bb8c303aae30171bf27d533ce58f12c59adfbe9dfe9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or engage in phishing. The primary attack vector appears to be a malicious attachment delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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 http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hqmb4m1k4ld3dfuloj558pmcfb/51728426911.pdf In PDF document text
- http://avandcie-automation.com/ckfinder/userfiles/files/8921892903.pdfIn PDF document text
- https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/k4471lch26o4bdhkall4iar9l9/12967684383.pdfIn PDF document text
- http://www.mustwalge.ee/data/content/files/98654977769.pdfIn PDF document text
- http://dichvu12h.net/userfiles/file/zixoz.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e665504fb2---pafobajutejiw.pdfIn PDF document text
- https://hamzsabegi60szallo.hu/UserFiles/File/43083929780.pdfIn PDF document text
- https://biogenetixpharma.com/ci/userfiles/files/xudogij.pdfIn PDF document text
- https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nodofuwogepikisexeka.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6f5c23d9f41e104669a861157bf1dbdd/55514421660.pdfIn PDF document text
- https://proxus.nl/file/kiwejepuzitunufur.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///tetipaluvokezigopakak.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cgoetu8hb16to020rkiohjrl27/29733839944.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f461363567---gubegujalu.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6ce3e789d45b020c1be5d3b02895d9a9/nasomat.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8dab316d---13222609533.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fe967e1b5---faposonudizurizabet.pdfIn PDF document text
- http://iuoooo.com/filespath/files/20210826043431.pdfIn PDF document text
- https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ugej1m50gq4p2s6ic72hgq1to8/5091474507.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94a3c7b40---jalojaguwatipagelepulu.pdfIn PDF document text
- http://odesignlab.ru/admin/ckfinder/userfiles/files/5075489082.pdfIn PDF document text
- http://tubietelbar.hu/uploadfile/82614504825.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6f7aa613fb---dovuzovokoruwegagoxubus.pdfIn PDF document text
- http://coimbra.hu/uploads/ckfinder/userfiles/files/63878948338.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/188fea236a6d067e6f6134c63312dfa4/dupusidefubadaderi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+art+of+theatre+then+and+now+pdf+freePDF 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_off0000f91f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF91F	18636 bytes
SHA-256: `21e500c91842c46eeb0679f64751e56dd421489860b8924dc9c33a97dea18770`
`font_01_sfnt_off00012932.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12932	10340 bytes
SHA-256: `567bdb9961094d98c35e8374911bb58bfd052e8230e2710fdd1b5a24b86e67c6`
`font_02_sfnt_off00014089.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14089	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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