PDF malware analysis — malicious · a837bf952d4308e6

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 14:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: ebe78bb9c770cb2557d1b2d9fe06c91b SHA-1: 88c77a7d8c890d318ddbe0b5ff83fca73d4a9fba SHA-256: a837bf952d4308e61d1b24f6f2e335f0e3c22635ecb56646854784f17b1b528f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to redirect users to phishing pages. The PDF structure and embedded URLs suggest an attempt to trick users into visiting malicious sites, potentially for credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=idmji+coros+pdf PDF link annotation
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ad78bebc---30994269835.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1212c8f5e---dugogefowezo.pdfIn PDF document text
- https://aradmissions.com/ci/userfiles/files/ditenemujarimesivuwop.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a316c1ddb31---munixifenipivelanago.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092a45a1bbe5---56665037374.pdfIn PDF document text
- http://nemdanangpho.com/uploads/2021-06-06/images/files/nafuwipufaxinelu.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ncqsf7nqfuac21887c0v4g58m9/mejosogovow.pdfIn PDF document text
- https://panificiopasticceriabattaglia.it/file/34144723076.pdfIn PDF document text
- http://mcutech.net/upload/2021/08/file/1629964902551429512.pdfIn PDF document text
- https://adreshosting.com/calisma2/files/uploads/78265856862.pdfIn PDF document text
- http://kahounova.cz/userfiles/file/buboxa.pdfIn PDF document text
- http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/zeropowomexabo.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dvunmm030p9h23u4vv990bp07a/50297919658.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1f5lprsr6cf24m7cqi7meluri8/69579645746.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/se1drccinikkppfpcesfibeen7/34710465976.pdfIn PDF document text
- http://gowowdeli.com/uploads/files/kajipigugi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a67c68c35---37265424032.pdfIn PDF document text
- https://accu-split.com/userfiles/files/pufifodifu.pdfIn PDF document text
- http://thoitrangvabaoho.com/Images_upload/files/87078667092.pdfIn PDF document text
- https://businessservicesuk.com/userfiles/file/zepilabup.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d55b818e6---93564712589.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0adf2e51da---65364946757.pdfIn PDF document text
- https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/61718142338.pdfIn PDF document text
- https://istanajp.com/contents//files/52112174180.pdfIn PDF document text
- http://szpitalstrzelin.pl/userfiles/files/667790023.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_off0000b8d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8D6	16724 bytes
SHA-256: `bb44f4916fbdd19fcd14092fc74ab22632f7d7cf3a68be47eb699c11e8f85b21`
`font_01_sfnt_off0000e435.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE435	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fc4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC4C	10320 bytes
SHA-256: `245287fa14857949b00b11ec6b2171d96bfb413282d2e417cc64271e397dc93e`

Open this report in the interactive analyzer, or submit your own file for analysis.