PDF malware analysis — malicious · ec66b628001c3061

MALICIOUS

PDF

95.7 KB Created: 2021-08-23 13:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 6ce03d9b5ec95979a015eb096c0e2463 SHA-1: 0fa2b9917bfb78da22e0f511b2c6f3d8fefb633a SHA-256: ec66b628001c306173ac171697775d7aed5050e7e86e9841d23d2624968cd1a6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of distributing malicious links, likely as part of a phishing or malware delivery campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9894

Heuristics 5

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://promtour-rural.ro/userfiles/file/31466249778.pdf In PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6f72e9ba50e801386626683c26d737b9/zulifasavuvujelilolude.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69233cb958---punekeruza.pdfIn PDF document text
- http://big-blue-bus.com/pics/fotos/1/file/78137148586.pdfIn PDF document text
- http://2013.letnifestiwal.pl/ckfinder/userfiles/files/3201501335.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/lapixekepimanijewavev.pdfIn PDF document text
- https://vidaleve.net/ckfinder/userfiles/files/junidokidokorosaf.pdfIn PDF document text
- https://thietbidiensino.vn/media/ftp/file/69074184117.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea2b1f4207---wifelivazesilinatuzujak.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b30a51107---29576847407.pdfIn PDF document text
- http://tamlaproject.com/userData/board/file/72464613895.pdfIn PDF document text
- http://suankaew.net/upload/userfile/files/puvupe.pdfIn PDF document text
- http://www.rify.us/cms-uploads/files/62702397403.pdfIn PDF document text
- http://tubemakingmachine.com/uploadfile/files/diverazijuded.pdfIn PDF document text
- https://np21bellapalermoshopping.it/file/80077489644.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9a4a83bea6982a22f04d234db174e87b/94811874167.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/722fe86c2cfb5789008c2167660514d7/68524414611.pdfIn PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ul1d3ccvgkmgkkgqihgpjat62e/35240748633.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f998de62---10987435777.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4rvqv2vsno9ak6vs4pkh3rpbq2/xevimerisag.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/13fee77d162293239d12dac8de584202/18695855912.pdfIn PDF document text
- https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/171cc6a1be69e7dc2e2fabb15f302b91/92981643122.pdfIn PDF document text
- https://peltonfell.org.uk/ckfinder/userfiles/files/54977880287.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/r2lvjbdritab4b4uo62m2tmhna/22377847447.pdfIn PDF document text
- https://parklanehotel.asia/userfiles/file/linonalasilonuxusufuxuku.pdfIn PDF document text
- http://noahmission.org/dataroom/file/lapevedujogurap.pdfIn PDF document text
- http://deeringbayrealestate.com/userfiles/files/modoxosogev.pdfIn PDF document text
- http://donateagift.eu/userfiles/file/jumidep.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=numbers+one+to+ten+in+arabicPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off0001181b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1181B	22996 bytes
SHA-256: `19ee2a040808de32fe65b36cd7796693b3cbb1e720ad842bfe6ed8459de5851d`
`font_00_sfnt_off0000e7ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7ED	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010004.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10004	10560 bytes
SHA-256: `54ba5003d3fe89f75c6155e23196a9c152d004cc1785b7e3c1525f5d0f33eb3a`
`font_03_sfnt_off0001422f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1422F	17212 bytes
SHA-256: `45d45c12b84dc7f24a1c50791fa64079a29e7832bf4cbb0fe7becdcc465200fd`

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