PDF malware analysis — malicious · 408d39d7b5f01907

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 13:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 04eb027487d6f26f10475a0be7d2d404 SHA-1: dd65cfa0dc08a799e7c6d61c6a73224ca536e72e SHA-256: 408d39d7b5f01907c23120359cee42e7649d41a14d29ad542788c4a63f80db65

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate it functions as a link farm, pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://kp-bs.ru/upload/files/42996132782.pdf In PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c6f76a706---wukubusoxowepikudofodi.pdfIn PDF document text
- https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/68b74buje7ak27d26u2mecuu79/11550708140.pdfIn PDF document text
- http://kapsalonvogue.nl/files/file/4440344998.pdfIn PDF document text
- http://wildpflanzen-planung.de/file/26814696071.pdfIn PDF document text
- https://legouic-peinture.fr/userfiles/file/41759743263.pdfIn PDF document text
- http://domholidays.com/userfiles/file/8260050554.pdfIn PDF document text
- http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/xirudi.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d133c99b9---17272287226.pdfIn PDF document text
- https://istanbularicilikfestivali.com/upload/ckfinder/files/43080407866.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/zovoruzupetatoduf.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/49911ea6dc4042edf11e0501483934fa/15769362172.pdfIn PDF document text
- https://luminex.pl/upload/file/lomexi.pdfIn PDF document text
- http://vaness-sens.fr/ckfinder/userfiles/files/74811348305.pdfIn PDF document text
- http://personnelstrategies.net/userfiles/file/99839714702.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5d5d402ecaab62f13295d6536b41988d/49866815098.pdfIn PDF document text
- https://pjkconstruction.ca/images/file/19272615075.pdfIn PDF document text
- http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/tulujiruvuxukorudorivaju.pdfIn PDF document text
- https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e541b1c53a7d65833864e586466f43eb/23509173351.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1711d2b35---73744351239.pdfIn PDF document text
- http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/77487051803.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888a317d267---31436730252.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/govez.pdfIn PDF document text
- https://mbzgogo.xyz/web/img/podborky/files/13680468764.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=adding+and+subtracting+fractions+worksheets+word+problemsPDF 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_off0000d1ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1EA	11464 bytes
SHA-256: `3649f90a0b4d14be893bc292f2871ab9564d8a0bb5dc36fa2f02c3d1ce335fd5`
`font_01_sfnt_off0000ec83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC83	17712 bytes
SHA-256: `477d9a11fbe7cd386679a59a2435890b22a65279de320e1e33111c88684ba946`
`font_02_sfnt_off00011a39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A39	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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