PDF malware analysis — malicious · 258e9bbf4a1945e6

MALICIOUS

PDF

82.6 KB Created: 2021-06-30 04:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 7479ccf411cc4a83c26b0e5880eff405 SHA-1: 1ad8a87ab421167f95e7d2a0ff57c8583a8cc047 SHA-256: 258e9bbf4a1945e6fabca808b6366cdbdc569dcc01c1c19723540b1a76c0b53d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress sites and potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://huntic.ru/uplcv?utm_term=child+and+family+health+nurse PDF link annotation
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940bf715c5d---28905451378.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107c7989e4---wutagajegukuvajerosoreged.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b54808f7---90831980527.pdfIn PDF document text
- http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eaf7fa6f---35541083974.pdfIn PDF document text
- http://atthaya.com/file_media/file_image/file/53373130882.pdfIn PDF document text
- https://castel.ro/userfiles/file/pagajide.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2d53489740bbb2900517911a4d0a1c7b/lenunakokisowekarek.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5a5adb60ed00db3f778da1e26ef541bc/85826061300.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7a7b5fcd1a6c4246046bd5797181d5d0/lupamekutenod.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f020fbc7a0---vesenuzesizegotuvomeb.pdfIn PDF document text
- http://oreade-breche.fr/userfiles/file/lopaforobawuritona.pdfIn PDF document text
- https://ratco-hardware.com/Ups/files/safuwirogikupoki.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/86736122529.pdfIn PDF document text
- http://cedule-plachty.cz/files/file/gorizobekikasalaz.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/46310548738.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722701d5d23---9454767281.pdfIn PDF document text
- https://seedomoretravel.com/files/files/30401653219.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d191043a---xamegugamukewozoderawafu.pdfIn PDF document text
- http://studiopassarotti.it/userfiles/files/79356344674.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c57bc902---52834107874.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/e62cmrackm064of2mj7urqqddq/17270629272.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/bd284cf645bc23a0acd3e1c9e0179e90/ferasivifuserefibiles.pdfIn PDF document text
- http://blpest.com/UserFiles/file/84936306407.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b6bdac03f---73677517336.pdfIn PDF document text
- https://masini-de-ambalat.ro/images/userfiles/fagiwisil.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_off0000e00d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE00D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f824.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF824	10744 bytes
SHA-256: `8c4ee57b1415cb49ea6c5fdb24886a98dd7dcd4b96f0c6328443107b38a1f21a`
`font_02_sfnt_off000110a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110A4	17096 bytes
SHA-256: `69f7b45335477e68721a6d1c7fbee30e0a595109d523e301dc264e087c42388d`

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