PDF malware analysis — malicious · cf9548285733c8fe

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 10:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 89a5233b0f2d86d6168c3e396cbf9b5c SHA-1: 7a5e6e65355455876aa36dc20cf99c619b8a5cac SHA-256: cf9548285733c8fefb2eaa9d7d21bddb3d4a91e4c41db218f613b0d48ffdf4e6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a link farm indicates a likely spearphishing attachment vector, aiming to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/hvntb77oaj418escihhac0hq15/23389377973.pdf In PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/q40ehndqbuenbjt6vm8r1gorv6/94035425290.pdfIn PDF document text
- http://indecomavo.pl/inc/falawabewigemogujirurefe.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cca6c508722---65570809653.pdfIn PDF document text
- https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a467bd74228---63074268163.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5db580fc---bukotofezimizeri.pdfIn PDF document text
- https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b560712ead2c57ef68c5bfa7641392e4/74302093028.pdfIn PDF document text
- http://ccforum.kr/uploads/file/1623658823.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9072e3a966---medakozevamezamaje.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kre163d2k9gji6iluemg3llfph/56726508872.pdfIn PDF document text
- https://ghnservizi.com/file/gikolaz.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fbccd8a8ed4b0796c17f21b4ee6738a3/6877438935.pdfIn PDF document text
- http://cn-polylysine.com/d/files/48371073042.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4a230b19b8d1f1a0d91b1112a2f3de36/74958401600.pdfIn PDF document text
- http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/45920047755.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ad9c119e4---wokezunuxibuza.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/puzila.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b10c7a16a---5763982072.pdfIn PDF document text
- http://atenngo.com/admin/sites/site/documents/xerakurovoko.pdfIn PDF document text
- https://summit-christian-academy.org/scauserfiles/files/salubutozagotopexeson.pdfIn PDF document text
- http://abovomedia.hu/_user/file/lenewilusegejumotipex.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5oe00k6t5ci384tt105dhlkdap/81494951938.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/59ddfd98f16b43129dd0272fc106e0e0/96114910393.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107eb328fb---numexow.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16e36fc4c---firesibezeji.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5f6adc3c---77758830936.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=single+arm+cable+pulloverPDF 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_off0000ed52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED52	17572 bytes
SHA-256: `0ac4b39142f6c66c584ff62617f00497b4eda2518415bae7634f6d2834ff3205`
`font_01_sfnt_off00011b51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B51	10832 bytes
SHA-256: `92de3ff252cc7a8f79ec9b3ef84f44a720e90bb2e7accabe5a499e5a700429c4`
`font_02_sfnt_off00013412.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13412	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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