PDF malware analysis — malicious · 81f346f3e9ec8c94

MALICIOUS

PDF

88.1 KB Created: 2021-08-01 00:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: fa476e3c0b83a96e0da722049a878452 SHA-1: ef6ed41471130d9afb8095711958ea6095d090dc SHA-256: 81f346f3e9ec8c946f7bf32850deaffc63f7b108017d3bec9ef8999e75a93209

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://ketchas.ru/uplcv?utm_term=auto+click+golden+cookie+cookie+clicker PDF link annotation
- http://akcjonariusz.com/UserFiles/file/wujazuw.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0812b1079---64601673324.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/6l66kjjn3n9b1ghmc4s109m9p1/botazozosiga.pdfIn PDF document text
- http://museodegliarazzimarsala.com/userfiles/files/xizazosanu.pdfIn PDF document text
- https://hitourkorea.com/FileData/ckfinder/files/20210722_1463545072A8532D.pdfIn PDF document text
- https://esperanzadeavila.com/fotos/file/21132969775.pdfIn PDF document text
- https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/3qvpp4lbbkshcqauqp896q6svn/56699804657.pdfIn PDF document text
- http://travelshops.pl/userfiles/file/20252439466.pdfIn PDF document text
- https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h81vkk546t7psk752ufcvh4t9o/38117843249.pdfIn PDF document text
- http://ccadl.com/files/20210725102031.pdfIn PDF document text
- https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a715052029353b6e84b370d27971fb9e/pinomasulat.pdfIn PDF document text
- https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/migdb8mnqu5li6gfq4logjdb3d/vavesuwadabila.pdfIn PDF document text
- http://booklandbooks.com/userfiles/file/92534662345.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e3c29aa06cf5e677e8d72aafebd76a24/bafiwesosapi.pdfIn PDF document text
- http://dreamcatcherltd.com/userfiles/file/20298020751.pdfIn PDF document text
- http://ggmtc.net/userfiles/files/34113292639.pdfIn PDF document text
- https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/dd37ee75736fd8de74d368e7041744f5/2723251514.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105997420c01---9010941268.pdfIn PDF document text
- http://ladyvenus.it/userfiles/files/gobedojitugifedekorezuxe.pdfIn PDF document text
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/drplj9nq19647kkvl61sslfoo5/rifosataxiwuka.pdfIn PDF document text
- https://investincarpathians.eu/app/webroot/media/files/resipewuzopikusep.pdfIn PDF document text
- https://shiokuda2.com/contents//files/17464282976.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/13fee77d162293239d12dac8de584202/18695855912.pdfIn PDF document text
- http://pratiklinik.com/img/userfiles/files/bizedukoxogujal.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d926bf4729d---lagepezusuwajarugi.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2207b51a15---fewetefe.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_off0000f193.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF193	10388 bytes
SHA-256: `06f3a2d66a9bfb3514d5f72bbf28efab532693c5f2dcf7cbca0d721b599c9a70`
`font_01_sfnt_off000108f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108F9	17872 bytes
SHA-256: `2a0b20be9d65fcc59885b42da3e4db2b43d9d3e203ef2acd7a1141069c60db61`
`font_02_sfnt_off000137b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x137B8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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