PDF malware analysis — malicious · 911a9d751aa5f187

MALICIOUS

PDF

90.3 KB Created: 2021-08-04 12:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: a1fe373ed39c009df347729143d550b3 SHA-1: f6f89f8e07781316f1fee7e2ccbf9e28681f3b6f SHA-256: 911a9d751aa5f18784772bbd9af0f784d8e11a188d5ec9817eabd986728bbf87

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, containing numerous external URIs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

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://crewmak.ru/uplcv?utm_term=how+to+make+a+wax+seal+stamp+in+photoshop PDF link annotation
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/517c32db2abec0ce287d404a987b82ef/84792386380.pdfIn PDF document text
- https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c921359a---zitek.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a0ee8ce98305a7ab031c745f85ad3f4b/zutozagaduwivevawoxabe.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd34137157f---sasaxajeniwi.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607346cdb02f5---99308356876.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8abb480f6---85593357225.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0aeb45f4---12219932070.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eaf9d4487---gisefetexakokupodaganuj.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/51kl2cbk40udqeoiugcbjkemtc/kadutenox.pdfIn PDF document text
- http://moonlightmontessori.com/upload/files/wurelupatu.pdfIn PDF document text
- http://globalquestconsulting.com/userfiles/files/22972540733.pdfIn PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7eda134a5837a501f06b01091a53c013/reluleduzalawenobav.pdfIn PDF document text
- http://www.corazondelsol.es/ckfinder/userfiles/files/98985094986.pdfIn PDF document text
- https://locktactyuma.com/userfiles/file/37462923758.pdfIn PDF document text
- http://fitviewer.biz/files/file/79488360251.pdfIn PDF document text
- https://fruitssupplier.com/app/webroot/img/files/nemina.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e32909e33---xiwotita.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3b7fe40e7e918d3fc185fc02e7f7f05b/miwagubame.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/57251f86bfec639cf33b90160a1da956/81593907547.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sg504l3oni4m6lcan9dav4tsp8/zakog.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ac791b930b9ec94d083f826102c75783/fuzasaluso.pdfIn PDF document text
- http://cyklo-sport-servis.cz/UserFiles/File/47844169314.pdfIn PDF document text
- http://tortsurprise.ru/upload/redactor/files/13005877992.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f9f6ae34---99778934473.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3537b06686a716db07fa5d2bc931792c/16198519251.pdfIn PDF document text
- http://qca.ch/userfiles/file/vidozim.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_off0000fdc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDC4	17024 bytes
SHA-256: `d7ae6e6452dc3051e5ff9121de16099e07c30a1412f62006ed38e060de155d1c`
`font_01_sfnt_off00012a29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A29	10688 bytes
SHA-256: `25f5298f90cff3a7bfb78ad1c121e676eac662083ab1c1ff9bbdda5e6db69eb2`
`font_02_sfnt_off00014279.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14279	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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