PDF malware analysis — malicious · 9d13b69a6426ff4a

MALICIOUS

PDF

94.3 KB Created: 2021-08-15 14:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 5e730f9462c12894e73c386cd8e7149f SHA-1: 1b5c425781b2c2a6a36cfb81ad0a93472998e2e3 SHA-256: 9d13b69a6426ff4aae9ac1dcb5404594b2606b86724a43cdb9e4fd2504845746

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions, such as redirecting users to phishing sites or downloading further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 https://excore.hu/ckfinder/userfiles/files/93975670258.pdf In PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ae0446afe02642eb34f22cef04107748/kanogufozirawij.pdfIn PDF document text
- http://suleymanporoy.com/img/userfiles/files/1505767250.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4e6a67a0---67539647232.pdfIn PDF document text
- https://reparation-mobile.net/userfiles/file/84419961160.pdfIn PDF document text
- https://lrsinc.co/userfiles/file/21234917672.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff0d4f3ff8---74461489159.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5aito6se8k979ikuc00nbb6gjo/rokerumivepikawuwarune.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae63d7c478---kozoberuwufixed.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9a25475c---69865065770.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197b1a5d50---97256036375.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e748d255ca67b3a01b9fcd8af2202cd9/11276826161.pdfIn PDF document text
- http://kavtas.com/images_upload/files/39509647685.pdfIn PDF document text
- https://universitecentrale.net/uploads/FCK_files/file/wudoditobupetetalufipen.pdfIn PDF document text
- http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca580d8dc8---58798024267.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607624882d3ac---21378199457.pdfIn PDF document text
- https://alamansyria.com/userfiles/file/suzulaju.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e583c939---nalujeguzon.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/46fad3f7d5f730dbdfb8f6d00f42af9a/6425317476.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/827b78a67b5c3c07a523611ab7b5ff3e/4871755752.pdfIn PDF document text
- http://sys-svinding.dk/userfiles/file/17594815760.pdfIn PDF document text
- http://ogledalata.bg/uploads/pages/files/liwemazigiguvasokikeso.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+molar+absorption+coefficientPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f257.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF257	16168 bytes
SHA-256: `1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68`
`font_01_sfnt_off000107ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107EF	19000 bytes
SHA-256: `edae691abf2e5ca8383d89b556568002242a4937aa1f44c42c9b8b8aba1fe000`
`font_02_sfnt_off00013a42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00015259.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15259	10880 bytes
SHA-256: `7522319e3ad06cd82640da9716c0f6d40f10d59ae0cbf610c1de24f19c6ac4da`

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