PDF malware analysis — malicious · 81e450cfceeafada

MALICIOUS

PDF

93.5 KB Created: 2021-06-30 23:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a09c7c3be629ae9894615a991d416feb SHA-1: dd9ada19d9b547c48e5b936d2f58fd198fea6061 SHA-256: 81e450cfceeafada3bafaf1e7bb7a210ae588400676a340472c6628e3cb5406b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to a compromised WordPress site, indicating a link farm designed to obscure the true destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts hosting PDF files suggests an attempt to distribute malicious content through a network of compromised websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9806

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffd4a3d6a---12862462910.pdf In PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f0149dae515fe7524c11ca001f0d74ed/nelet.pdfIn PDF document text
- https://tecnibat.net/uploads/archivos/rogigawugibejuxow.pdfIn PDF document text
- https://hometeamcorp.com/images/usr/bedodebiri.pdfIn PDF document text
- http://mientaytourist.com/uploads/files/gijukowamibu.pdfIn PDF document text
- https://stallion-international.com/userfiles/file/7727417983.pdfIn PDF document text
- https://grandplaza.bg/uploads/assets/file/popaneruxujomuriger.pdfIn PDF document text
- http://cnc-soustruzeni.cz/files/file/nukepozugakejipuviligulib.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/017739acce1d330e7d8cb437041b5b0f/51800877227.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6ec7284ad639d91f6cf720226723c6ab/85620162607.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c4bc5093fd9deaf76d48106acb40170/64203464511.pdfIn PDF document text
- https://skvacations.com/userfiles/file/jinoxololugolijo.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa370bed507---29969660938.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a107ad4bc---vuzuvigokesemadik.pdfIn PDF document text
- http://aytekinpolatel.com/image/files/289198053.pdfIn PDF document text
- https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/9cdde57781a346143e58b047b1332c28/87414018263.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/242c0b90cda5872a00d4c4636790f8bb/74969297658.pdfIn PDF document text
- https://arrayamed.com/userfiles/file/lotuwutanitaloj.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0972c55c0d---5712511555.pdfIn PDF document text
- https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b257494e9a6a485abad22a8e1003a94/84903123679.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f35041b5---ralewimopidafawejo.pdfIn PDF document text
- http://fornacedelia.it/userfiles/files/4410263152.pdfIn PDF document text
- http://quickvideo.nl/userfiles/file/tuvugigewutetareg.pdfIn PDF document text
- https://fivetc.vn/uploads/files/pozesefimavozanejipisowu.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9e0541a012595c27a85c2ad4e9ab4be9/37233343021.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab53701005e---59404787232.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c949d7f649---wazufitojinexawu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=apex+download+size+pcPDF 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_off00010a97.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A97	17484 bytes
SHA-256: `ec6eb385eba1d1e9fac3c96b937bbd666a1c8ebc5a360b856fe7be8ea3f9bdfb`
`font_01_sfnt_off00013891.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13891	10540 bytes
SHA-256: `cae0b522262e803d443d1cbcd8703a7603721b77cee0bd0b5fa7adcb71a8682a`
`font_02_sfnt_off000150d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x150D9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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