PDF malware analysis — malicious · dcf87514a3b89d04

MALICIOUS

PDF

91.6 KB Created: 2021-09-05 11:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 9595d949c3cd2066f31678c306239fd2 SHA-1: eb924e32d87fa3493421d2b93e17b301fe80fa9f SHA-256: dcf87514a3b89d049a81e69bba371832d1a71e29f1241e514a72b0dd297983e6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, directing users to a variety of external websites. Several of these links point to compromised WordPress upload directories, suggesting a potential for hosting malicious content or facilitating further compromise. The ML classifier strongly indicates malicious intent, and the presence of numerous links on potentially disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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://bookatowncar.com/userfiles/file/zadem.pdf In PDF document text
- https://vetamblj.si/ckfinder/userfiles/files/tozekomolonatunab.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e23c1cb7a52---63197089589.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4634ba38c---11646983323.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c55755966---92718355456.pdfIn PDF document text
- http://topcudental.com/img/userfiles/files/ratorujizukolo.pdfIn PDF document text
- http://china-miyaco.com/img/file/202161223437.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a0b2eb1c5---28798098428.pdfIn PDF document text
- http://world-spa-resorts.com/dok/rozaw.pdfIn PDF document text
- https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/bc1ee9d148202d9e20b37ef56aab9a36/30571243936.pdfIn PDF document text
- https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/7543284654ff6a5137b8b774f6b16fcb/nogumiveso.pdfIn PDF document text
- https://nbtele.com/en/cache/fck_files/file/tesoveludibisi.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d04b6aa054---11847009040.pdfIn PDF document text
- https://strategieb2b.com/userfiles/file/33729397263.pdfIn PDF document text
- https://horizontire.com/userfiles/file/44667757257.pdfIn PDF document text
- http://www.ximangsongthao.com/app/webroot/uploads/files/kumasupumara.pdfIn PDF document text
- http://safires.cz/ckfinder/userfiles/files/71375636303.pdfIn PDF document text
- http://canvangdientu.com/images/file/2672361051.pdfIn PDF document text
- https://protectname.xyz/whoisprivacy/userfiles/files/subiboje.pdfIn PDF document text
- https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/zixarepibaxemutij.pdfIn PDF document text
- https://rubin2000-distribuitorshop.ro/userfiles/file/99920155509.pdfIn PDF document text
- https://sieuthimaytinhcu.vn/upload/files/nesewogiso.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d491fa5a547---60771477075.pdfIn PDF document text
- http://harasim.cz/uploaded/files/91680002847.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=patogenia+vih+pdfPDF 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_005_off00012a62.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x12A62	18616 bytes
SHA-256: `4fb498d1446a5da8e867faee45c276fae081ff5a938d37ffc4dfd4257da97a15`
`font_00_sfnt_off0000defb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEFB	10528 bytes
SHA-256: `2b94a9b2c84263bcf5d91ebe1ec4687477cf92e73b2de89e2c98d85fe5796cab`
`font_01_sfnt_off0000f6b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6B8	20080 bytes
SHA-256: `af525e4a20eb3e7478a2d7a7557a1af104a26cfec1e3fbce1ecfc9a36026ed5f`
`font_03_sfnt_off0001483d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1483D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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