PDF malware analysis — malicious · 7b8fd3118c228b4c

MALICIOUS

PDF

73.7 KB Created: 2021-06-29 09:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 2f569202b50ab7e973139d674ba36f24 SHA-1: 6b455aca4fc45a5ea431b309589a82a0f5227004 SHA-256: 7b8fd3118c228b4c37c6f09e82736ea85164bdd3bc4cc45b4d669ade61c34608

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests this intent, as it indicates the document provides password instructions for an archive. While no scripts were extracted, the presence of numerous embedded URLs and the nature of the heuristics point towards a downloader or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

Heuristics 6

Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://nomylo.ru/uplcv?utm_term=how+to+send+a+filled+in+pdf+form+by+email PDF link annotation
- http://niestachow.pl/data/aktualnosci_imgs/file/begupuwerunudezoreziz.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc70fa9767e973da7da025cb77ced48c/mediguwimetobevorelusotuw.pdfIn PDF document text
- https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4da6a7725---84695667821.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5fd1a4202---47982490621.pdfIn PDF document text
- https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/08ovq0ju5adlorbm3p6ni345u2/8628228900.pdfIn PDF document text
- https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/840a29c632a2628b977c6c98897e4f73/fojisuvo.pdfIn PDF document text
- https://ubk-sad.de/azubi/userfiles/files/29786163986.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c35842aa1---jinopiripodijifesut.pdfIn PDF document text
- http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/siguseletojulaveloxibize.pdfIn PDF document text
- https://samarthanamparisara.org/apadmin/uploads/userfiles/files/lizunewa.pdfIn PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/089542155dd85c44ea79a8e2f7057964/turazotugatudajuziluda.pdfIn PDF document text
- http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16077258188972---84871690927.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c56963e1266---5590325966.pdfIn PDF document text
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609620eb45974---12080307851.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8dc1c82b4---vixobasovalex.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27e82bcc0---62095866324.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b05331f80d147a769035c25e6672ff70/19172846553.pdfIn PDF document text
- https://thepainter.asia/upload/files/1335314469.pdfIn PDF document text
- http://abnicum.com/files/file/34774896609.pdfIn PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0d4no277fvr7gmccke3sg0b4g7/93881228292.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/i8gceosnjc5moqd9m8o6hujqq3/5499388157.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb61d54285---jefamawiguxekevato.pdfIn PDF document text
- 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_off0000c029.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC029	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d83b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD83B	15676 bytes
SHA-256: `1a19a001f5a4f94ec7ebc4abf2e1d8d67c4771075f1fbc2a0146d14aa5cf7b08`
`font_02_sfnt_off00010029.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10029	10988 bytes
SHA-256: `59fe5f3e3bcc1ee8fe0b5a43079cb4e9e54f3d4098e99158a8801e047df34ea7`

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