PDF malware analysis — malicious · fa773f32a50ef8ba

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 23:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: ca09d750d051a451030fb86a88d68f4d SHA-1: 73ca3383713812bf67988b275f31e1799c02427f SHA-256: fa773f32a50ef8babefd10b2efa64a9566e2ef2d24c008edb050ca8fe0b52d2c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests the PDF is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is a link farm, likely intended to distribute malware or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://pistant.ru/uplcv?utm_term=financial+instruments+and+exchange+act+pdf PDF link annotation
- http://kovacsoltvaskerites.hu/images/file/89819337788.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/af9673c4144092fa36f9b0feee15853b/sagonobezivasodudewap.pdfIn PDF document text
- http://xdata.pl/app/webroot/img/ckf/files/64394341593.pdfIn PDF document text
- https://vigiweb.cl/dinamicos/files/file/lapededok.pdfIn PDF document text
- http://polyalpan.hu/_user/file/3318896761.pdfIn PDF document text
- https://villanakarin.com/userfiles/files/paxojugusufifive.pdfIn PDF document text
- http://netinflux.net/userfiles/file/7318536417.pdfIn PDF document text
- https://atvatextile.com/upload/ckfinder/files/2950697368.pdfIn PDF document text
- http://handbook.hu/upload/page/file/tavegetevetewaneb.pdfIn PDF document text
- http://vitanova-cattery.com/upload/file/ritoxotafuka.pdfIn PDF document text
- http://yourbuilding.ru/userfiles/files/lufujovemunu.pdfIn PDF document text
- http://bbfrontedelmare.com/userfiles/files/beduzixabugejigan.pdfIn PDF document text
- http://wksx.top/images/userfiles/file/xozutoxuwituk.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3a46b5f0e3f5faf35d3af9901d674076/giwididebujegu.pdfIn PDF document text
- http://sp3siemianowice.pl/userFiles/files/rurefeniledegasilixo.pdfIn PDF document text
- http://canadanur.com/resimler/files/tibilalagesiditifovi.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f1492189f0e5072ffe6a308620445da9/niwetisafupap.pdfIn PDF document text
- http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/kasesotogusemazezajolu.pdfIn PDF document text
- https://securityguardsupply.org/php/uploads/file/80303862299.pdfIn PDF document text
- http://alphasigmaoverseas.com/userfiles/file/vavisegotenezelurewido.pdfIn PDF document text
- http://probeg2000.ru/files/userfiles/files/86094262885.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4cb33fade---54673964281.pdfIn PDF document text
- http://skisun.it/userfiles/files/gazukalowowud.pdfIn PDF document text
- https://yennenga.org/business_school/uploads/file/62339294467.pdfIn PDF document text
- https://asset-books.com/userfiles/file/titimuwalobewonoli.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_off0000b97c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB97C	11128 bytes
SHA-256: `1867499249c87170f81444795455101fbeb20f9c117c1ae2f3960617f498bf07`
`font_01_sfnt_off0000d30a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD30A	15296 bytes
SHA-256: `ef7c4d1b3e62cdaa700114fd99755b83c341a732329b5237c54b761f8b703b0e`
`font_02_sfnt_off0000f9d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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