PDF malware analysis — malicious · fcb30e44f7ed1e6c

MALICIOUS

PDF

81.7 KB Created: 2021-08-15 06:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3d74fa8fe3add8c5498f687d4daf1c01 SHA-1: 09fb0520565c30cba35ed7c34d8ee4afe3bbbd73 SHA-256: fcb30e44f7ed1e6ce5c9301dce95026ce4b437cbf7fb03434fd2fc135249aec9

172 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting, suggesting an attempt to host and distribute further malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate effort to create a link farm for SEO poisoning or to distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 8

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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 http://shiinamotors.com/js/upload/files/gejiwetulapu.pdf In PDF document text
- https://grupo-kayros.com/userfiles/file/junalobidunijesikozexunur.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608086f992872---zoxemoxomigowafabegeb.pdfIn PDF document text
- https://parfumzone.ro/files/file/supebunonogopanuvimozuso.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6fb68e1f---8284754062.pdfIn PDF document text
- https://lordoptika.hu/files/files/lixum.pdfIn PDF document text
- https://forthepeoplegov.com/userfiles/file/supadilorujijufa.pdfIn PDF document text
- http://wdnederland.nl/file/paxij.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/r5vi9a2apfrqn6103p4kdq9r0v/lubadigesisililula.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/h6kaoi00m44gjvd5hv8f5qr2mj/6765384317.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6262806a5e---bipefafomesajebofafami.pdfIn PDF document text
- http://factory-01.com/js/upload/files/diguxowuditejaguva.pdfIn PDF document text
- http://www.biosafety.biz/ckfinder/userfiles/files/foriburumuketotutuluz.pdfIn PDF document text
- https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f6a0c90f04b95066b6eec32c1bb786c2/zowajenalikegufiwamudene.pdfIn PDF document text
- http://romangruszecki.com/uploaded/file/kovenejomexobivut.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfac855fa0f---nokanatonozedino.pdfIn PDF document text
- http://mauchlineware.com/html/chapelstreet/web/userfiles/files/66518553673.pdfIn PDF document text
- https://sport-jicin.cz/dokumenty/fuzerizidonevubimefux.pdfIn PDF document text
- http://fullcolorspandoeken.nl/userfiles/file/85747706359.pdfIn PDF document text
- http://studioarclab.eu/userfiles/files/senuvekuluzotip.pdfIn PDF document text
- http://mfahk.com/upload/files/24897456224.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8523298fa---dakakemomubekexov.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e08392dbb50d8e42767bce6d1327c5c1/3029871745.pdfIn PDF document text
- http://bajajsports.com/userfiles/file/69075458005.pdfIn PDF document text
- http://sbox-technology.com/upload/datoteke/xajuwezejofag.pdfIn PDF document text
- https://x-software.cz/data/file/29147744547.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+ks3+english+comprehension+worksheetsPDF 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_off0000da55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA55	17208 bytes
SHA-256: `58512f6d620d3124f95302bf638678cf545bb8e4fac81b07e3fb5aa24514dacd`
`font_01_sfnt_off00010742.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10742	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011f59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F59	10984 bytes
SHA-256: `ba9d50f5983dcca7b83c6e49308b811c410888c0b5f79b407d1ca3da1e296b38`

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