PDF malware analysis — malicious · eb89fb1d1c8df173

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 07:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 54d666fb8833185d9ad12abb41f1e2ba SHA-1: 491ed2099b16432a26e4cf821e69c5397b322ceb SHA-256: eb89fb1d1c8df173a21bee9bac7051175a04aac511294c779cfe351e8375d60b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm on disposable hosting indicates an attempt to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://cubic.is/userfiles/file/71570344318.pdf In PDF document text
- http://sparkpro.lv/content/file/naguxudika.pdfIn PDF document text
- http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f2061130---36606312547.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/1d3a63f87b5e71919ea3739a079dd903/dutulugeda.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdf1a77ac---10734080973.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b996055f2e1842173cbb8ff01fb65da0/lalebabu.pdfIn PDF document text
- http://kapsalonindex.nl/images/uploads/wakin.pdfIn PDF document text
- https://terlickodds.cz/www/www/fckphotos/file/xunenijepovosanivan.pdfIn PDF document text
- http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/zofadosexiwosemabo.pdfIn PDF document text
- https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/gqbl6ns8i4elm1c0u4pv1voecv/pibakofu.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607169b12d1c5---keteguxafekedatukut.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b14b8a858---62764140466.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42bd377f6d---vepoxiboseronorezunoke.pdfIn PDF document text
- http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/4980594866.pdfIn PDF document text
- http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/mikogopof.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec9ecb910---5472549397.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8c1b254b786e3c696d0eda2a7b1045b5/dinitalixose.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c4c43dd---fominivimisoni.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/79169830474.pdfIn PDF document text
- http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/44f0b9162c7ff63f9ce28f3ca57f4448/ditonatubexobego.pdfIn PDF document text
- https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/effc211e1e16a75d9d4b4f6797e06088/modesilakazuveduwisopo.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/47a4f75a41a51ab2fb7c831c4b09ace9/3559055917.pdfIn PDF document text
- http://aldara-latinoamerica.com/userfiles/file/35497469031.pdfIn PDF document text
- http://bualuang101.com/backoffice/upload/files/fosux.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=your+name+full+movie+english+dub+watch+onlinePDF 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_off0000f2f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2F1	17060 bytes
SHA-256: `cb9fc496f9c8ef829a6531456c95020d0aa1ce2c22d8680c7d87ae66d89b430b`
`font_01_sfnt_off00011f5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F5E	11300 bytes
SHA-256: `8670409c4816c552104fee762052c637174a7cefc63360646ab0204174cda191`
`font_02_sfnt_off0001398f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1398F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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