PDF malware analysis — malicious · 805f8f7b4da865bf

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 10:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 31b1868f1bc6446a4faa39c426d3d8db SHA-1: 0fbe8109116e5b01cb9fe7e5ea3446c53f03bf4e SHA-256: 805f8f7b4da865bf1c265f15fae4573e42dbab71c728894fcffe4211ae2cb84b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various websites, some hosted on compromised CMS platforms. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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=debussy+preludes+book+1+sheet+music+pdf PDF link annotation
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b58c740a423337655c38961ec1479ca9/12895241381.pdfIn PDF document text
- https://theelementrama9.com/userfiles/files/64515633827.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210723140314501254299.pdfIn PDF document text
- http://change4best.ru/upload/file/maxel.pdfIn PDF document text
- http://polyalpan.hu/_user/file/23561958842.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d54d67923f2c3800ac7ed9f56548758d/93037502596.pdfIn PDF document text
- http://phunhai.net/upload/files/muxubexavuxakonosaboxul.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608028a810a69---1256060028.pdfIn PDF document text
- https://instalacje-elektryczne.net/ckfinder/userfiles/files/lenugigoxapagesalikoporu.pdfIn PDF document text
- http://christopherdallo.com/file/nupojalugiw.pdfIn PDF document text
- http://bobiniauto.com/userfiles/file/49251248267.pdfIn PDF document text
- https://inoxquochoang.com/app/webroot/files/images/pages/files/kurudalonisaxuv.pdfIn PDF document text
- http://propellerclubsandiego.org/uploads/files/paxigemimiwezapajotorelim.pdfIn PDF document text
- https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/65b2eadc2bf6197da73aaa685f5fafc1/3176510472.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084a129e47e6---2627647370.pdfIn PDF document text
- https://moiatakashta.com/userfiles/file/40486399507.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8dcd1602e---gujevifalawivoliri.pdfIn PDF document text
- http://augustaelectricalwork.com/editorData/file/vomixapubimopopakatamiki.pdfIn PDF document text
- http://startmatbaa.com/userfiles/file/wotakabukinaxo.pdfIn PDF document text
- https://bustotoronto.com/userfiles/file/78806532378.pdfIn PDF document text
- http://strandedtattoo.net/file/xidabojegomumemunor.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/korokuwu.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc1c7e0176---85841459281.pdfIn PDF document text
- https://kis-u.com/page_data/file/20210619210825.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_off0000d295.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD295	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eaa7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAA7	17304 bytes
SHA-256: `da3ae41bf7faf14e958111be8806294950e6f9edfd9332e872af9fcf7b2f6291`
`font_02_sfnt_off0001171f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1171F	11116 bytes
SHA-256: `bc0d65e2019dae30ffaff68d1b24bc55f14716d2e36042f67eefb52b9e431f74`

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