PDF malware analysis — malicious · 07641a6bb58e4282

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 15:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 987016841a1a9feac71aab4a72dfbcc3 SHA-1: 32239ad8f137deee3997785ef70fbab3bdce7113 SHA-256: 07641a6bb58e4282b66d46ace8333097aed02970c4142d905edb80f4bd9c7b95

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or distribution point for malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common technique to trick users into executing malicious commands. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

Heuristics 6

Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE

Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840ec62d7b1---wodimiwelowa.pdf In PDF document text
- http://pallenberg-busreisen.de/uploads/files/83495692616.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/168d41ec5ab7773c43c4ac7e9e443404/karifemuvepen.pdfIn PDF document text
- http://waterlootour.com/FileData/ckfinder/files/20210616_B498FF261487FA05.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/366236823609306b0b902f.pdfIn PDF document text
- http://szpital-sulecin.pl/images/fckfiles/file/sobadepedozuruno.pdfIn PDF document text
- http://cz-synergy.cz/data/file/15924562729.pdfIn PDF document text
- https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/13b151a8c9b03f5d65bf62d05d0e8b81/zimobanodo.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31355e9d05---45284893639.pdfIn PDF document text
- https://eobliecky.sk/userfiles/file/11291013948.pdfIn PDF document text
- http://mudrkanuch.sk/editor_uploads/system/files/muduku.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f31791529b---senekuriwu.pdfIn PDF document text
- http://www.alex-vasilkov.ru/images/wisdom/file/zobajavanilolubodunogebi.pdfIn PDF document text
- http://studiogiamberardino.it/userfiles/files/21100487623.pdfIn PDF document text
- http://bumsnab.ru/uploads/files/72447049314.pdfIn PDF document text
- http://xinyuemu.net/assets/202107/files/20210716082111914369.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4dde6335e---2448941918.pdfIn PDF document text
- http://hocikto.info/userfiles/file/mowusubiwelege.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63bca3ec75---gasumobajubuxogitit.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3e085c1980bd5e2b2695bb194f47bca2/pedopugezurejojadixuli.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bazogopi.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/redovolikexumafetoze.pdfIn PDF document text
- http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16091d66095b64---pisawunafanonabunobetes.pdfIn PDF document text
- https://drsubhashawale.com/ckfinder/userfiles/files/12356449021.pdfIn PDF document text
- https://publicbridge.pl/userfiles/file/seronadogiwen.pdfIn PDF document text
- https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/p921re3v51sfri4sutpa96u9kq/73423481483.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=speed+time+graph+class+9PDF 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_off0000d5df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5DF	10980 bytes
SHA-256: `427562594bf3502fe0819630c33d5d0b754201c77ddc9c5a8962efa5acb26285`
`font_01_sfnt_off0000ef22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF22	18696 bytes
SHA-256: `ed2a007db05461abb34cb4a784465dd7a90b7ff9482310d23fd7fb5db4c516ad`
`font_02_sfnt_off0001203c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1203C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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