PDF malware analysis — malicious · c1c9912d6acc1626

MALICIOUS

PDF

81.4 KB Created: 2021-08-17 04:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 56a961aedf6d282e6e01a989bf3e0318 SHA-1: a8623c1a655aba1c83ed688f9eac60d041fd49fc SHA-256: c1c9912d6acc162617e96c0b7903d3edcbe980d575645f55c336b990bdb3f14d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it is not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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://assessmentinsight.com/ckfinder/userfiles/files/16968103891.pdf In PDF document text
- https://astek-telem.fr/userfiles/file/99596128422.pdfIn PDF document text
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9b8bc906e6ee94aafadfee7a6e02a607/rawozewibabawejinit.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/57350035841.pdfIn PDF document text
- https://rzfmuhasebe.com/userfiles/file/wekobipojazulokekezujuk.pdfIn PDF document text
- http://solarwindependence.com/ckfinder/userfiles/files/motukugedaw.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a60b05ff7af10cac07c7b68d099b75a0/17492077027.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1f34fb39---56555006403.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca6012e02---12495918370.pdfIn PDF document text
- https://fnb-concepts.com/images/uploads/files/visiwexu.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3c0e48ecc---tonelusixukekiramebabopib.pdfIn PDF document text
- https://pilot-nav.com/ckfinder/userfiles/files/tarerupajajanolumafonam.pdfIn PDF document text
- http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/77280694200.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5217b457---40286059672.pdfIn PDF document text
- http://aristosaigonhotel.vn/uploads/files/mokukazovoneso.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608404cba34fd---kavemasodozometar.pdfIn PDF document text
- http://bidwoodmachine.com/d/files/ruxukizumemotas.pdfIn PDF document text
- http://cpghollywood.com/userfiles/files/mobizukatekerepipilusujup.pdfIn PDF document text
- http://duquenne-moteurs.fr/webroot/upload/files/93131274431.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160998e9cf411e---vamilogibok.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c7acfa3fad9---mazodowukibosojif.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/munaghsioqu5l3d6r0g91gsb14/talizatalimizomavuxela.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/s48cq99maf2sv516uvb4pngn3q/43156129115.pdfIn PDF document text
- https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/060cbdc35d24fd64bb3cc0fb1adeb0ed/96157244677.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b04afc4863f---merowuwatovezuzuperu.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a482754d230---tenulufunuvivepevubanal.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=onde+comprar+o+livro+um+compromisso+por+diaPDF 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_off0000d64d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD64D	18712 bytes
SHA-256: `c5860f148ec0526e75b02965683ab6f0d6d221bde061130cc9cf4f814bc8e46f`
`font_01_sfnt_off000103bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103BF	10768 bytes
SHA-256: `0c6656b1ff32acd8976bc47d825d2b97f6d92d35e06f00bf49b9cf3fedb0ca5c`
`font_02_sfnt_off00011c76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C76	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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