PDF malware analysis — malicious · 5ea193063d128a50

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 02:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 5ee543c4520144f70945a1f0f41b36eb SHA-1: 578ee5550467c9cb8505e65158164d1f53c3c8b4 SHA-256: 5ea193063d128a50075a6703a811e41576ffb02c60429c81ccb358ddfb6e0ab0

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, some of which are hosted on potentially compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the combination of these factors suggests the PDF is designed to lure users to malicious content or download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa712c6f90---sowejivirovutosogabo.pdf In PDF document text
- https://fullprotec.com/ckfinder/userfiles/files/7792534429.pdfIn PDF document text
- http://abworder.com/uploads/files/51124388405.pdfIn PDF document text
- https://perfecthospital.org/ckfinder/userfiles/files/31799284005.pdfIn PDF document text
- http://mgtofubbq.com/uploads/files/50602930874.pdfIn PDF document text
- https://nieruchomosciturystyczne.eu/files/file/51627695714.pdfIn PDF document text
- http://aucontecnologia.com/userfiles/files/sefidobizevivef.pdfIn PDF document text
- http://polkovnik.su/upload/file/7616825608.pdfIn PDF document text
- http://www.llmhospital.com/www/js/ckfinder/userfiles/files/lesoviromibatujidozatul.pdfIn PDF document text
- http://vigova.vn/Images_upload/files/14648629167.pdfIn PDF document text
- http://caudafotografia.com/userfiles/files/rojat.pdfIn PDF document text
- http://cukiernia.eu/upload/files/joxagomabepuzuwijewi.pdfIn PDF document text
- http://viajaconsciente.com/imagenes/userfiles/file/xeximikuviwo.pdfIn PDF document text
- https://magnanerie-cazilhac.com/userfiles/file/gufisunipetatuwe.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614332da32cb3---tuxidizomogazowuvu.pdfIn PDF document text
- http://www.dr.schure.net/ckfinder/userfiles/files/33530345058.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161451fd525360---7215391859.pdfIn PDF document text
- http://landroverbh.com/ckfinder/userfiles/files/ponufotamakiw.pdfIn PDF document text
- https://ecoquimica.cl/dinamicos/uploads/file/93528178483.pdfIn PDF document text
- https://peterdegendt.be/file/wemipiwev.pdfIn PDF document text
- https://u-spot.biz/js/ckfinder/userfiles/files/bubagoril.pdfIn PDF document text
- http://residencelesaline.it/userfiles/files/zedezigorob.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h7i9gu8oktht133uciopdol8o7/2896712941.pdfIn PDF document text
- http://k12kos.com/ckfinder/userfiles/files/97350528843.pdfIn PDF document text
- http://diegogenna.it/userfiles/files/82588156369.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=magic+s2+download+apkPDF 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_off0000b269.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB269	10652 bytes
SHA-256: `71fdc643b9e1a4f013eed04d2e51fc9d1f89769c9ab5444ffc0a3b44944ed50d`
`font_01_sfnt_off0000cad0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAD0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e2e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2E2	14928 bytes
SHA-256: `1e874393a76234e42ac04950c9beb083263173c4b5ab3567a8aeec6f66208124`

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