PDF malware analysis — malicious · e9c168493fa51202

MALICIOUS

PDF

79.5 KB Created: 2021-07-23 01:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: adf04ac934603d2fdbb89973775e60f4 SHA-1: c49ea98610a6912ed26c81884d332b17bceef47d SHA-256: e9c168493fa512023cd1aa16f045cc81833ed64d7a2f46111fc87e4368e76e7e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads. Embedded JavaScript streams are also present, suggesting potential for further malicious actions like redirection or exploit execution. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

Heuristics 7

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.
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 https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fb9f57d55361f564c123c38768d7c46b/74160609810.pdf In PDF document text
- http://mientaytourist.com/uploads/files/7033621609.pdfIn PDF document text
- http://gildiamasterov.ru/userfiles/file/3420951832.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac95ac279---bopewagenebi.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/60863922378.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/43g5f9f15h03klcbkdl8os3m26/5851532949.pdfIn PDF document text
- https://faltprasten12.se/anvandarbilder/70/files/64155750417.pdfIn PDF document text
- https://spiuruguay.com/ckfinder/userfiles/files/85983393846.pdfIn PDF document text
- http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/rizaninudov.pdfIn PDF document text
- http://ajivikafinance.com/userfiles/file/pomuk.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61c787b30---felabasit.pdfIn PDF document text
- http://heibldr.hu/FCKfeltoltott/file/5869150658.pdfIn PDF document text
- https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/d271e27e9a155b4f85d7967969069c45/nuzovumifasomomiwefipoja.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f9bcf9e1---retevujotowijezegenuk.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vmdv5bj5hr61lvrpp0vifdoj3d/60073655720.pdfIn PDF document text
- http://www.dereformasenalicante.com/archivos/files/19727528386.pdfIn PDF document text
- https://taxforce.nl/userfiles/files/35256052239.pdfIn PDF document text
- https://drosamahetta.com/userfiles/file/muzokanukutaluvoxiluw.pdfIn PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd5b249b5---xamowoladomomokikef.pdfIn PDF document text
- http://www.jacenter.org/js/ckfinder/userfiles/files/30302256732.pdfIn PDF document text
- https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5da1763c8faa7a62379e963695c7c025/9620867137.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d0c07ca9869fbf593c252b8313b9467f/40258805121.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=physics+gre+solutionsPDF link annotation
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb791e694d---fafukusepanupirobun.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_off0000d37d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD37D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eb8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB8F	16908 bytes
SHA-256: `7500c2b40d4f8d55dedb0bb0642f6cfec551ee9f42cfc12f8f5c9caa5472ce4f`
`font_02_sfnt_off0001179e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1179E	10564 bytes
SHA-256: `1f7dec07cd7545645740aec181bc401509069fa719404b310025b8afa4cae9fd`

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