PDF malware analysis — malicious · 63b76e2f68dbc3fb

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 08:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 56e004db8f691ddff84f4c735371ee48 SHA-1: 6865173bcae6a6f1b697766a073508306a8d6906 SHA-256: 63b76e2f68dbc3fb34a9eab0e568c0a87e1468a2f202f40f641a5cad77f766a7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://pavillonwohlen.ch/userfiles/files/82727218268.pdf In PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/31f05f83695ef52a409a66ea047da68c/penusodevexezare.pdfIn PDF document text
- https://soudurelauziere.ca/upload/editor/file/54664657871.pdfIn PDF document text
- https://exihomes.com/userfiles/files/nenivusokus.pdfIn PDF document text
- http://projecthouse.bg/uploads/CKfinder/files/61323461793.pdfIn PDF document text
- https://gogreenonline.net/userfiles/image/fckeditor/file/gemudazedifegavajeneko.pdfIn PDF document text
- http://seto.cz/uploads/vofajitezozovogas.pdfIn PDF document text
- http://bloodfaces.de/attachment/file/geluwux.pdfIn PDF document text
- http://agisinfo.ru/uploads/content/files/47057769736.pdfIn PDF document text
- http://domesticsolutionsagency.com/userfiles/file/gurixemekeripujoruseteju.pdfIn PDF document text
- http://flyingfish-stay.com/userfiles/file/83801721277.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6m8ajp0tubauvvjol0vdr5qooh/26841165961.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-9-16/20210916024957887775.pdfIn PDF document text
- https://burkina-businessschool.com/business_school/uploads/file/muwomibusopexalomutar.pdfIn PDF document text
- http://design-klasse.de/ckfinder/userfiles/files/jesadenujiriju.pdfIn PDF document text
- https://pmapmc.com/userfiles/image/files/dafidifufa.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/a13o6gu2mj36dad3df6tjds1k0/22158795573.pdfIn PDF document text
- http://quiltingacademy.net/fckeditor/userfiles/file/wolakezufametosop.pdfIn PDF document text
- http://ambartakip.net/belgeler/file/divuxinutulikor.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b85161cb5e3a3c57de1899d38c043ca7/79724908610.pdfIn PDF document text
- http://snuhonors.com/userfiles/file/21085031161.pdfIn PDF document text
- http://hc6999.com/userfiles/files/9224946386.pdfIn PDF document text
- https://bodzlomu.com/userfiles/file/5207338892.pdfIn PDF document text
- https://www.willmarshelter.com/ckfinder/userfiles/files/tigolosikesi.pdfIn PDF document text
- https://medicabg.com/uploads/wysiwyg/files/7513964877.pdfIn PDF document text
- http://kmkonsult.cz/userfiles/file/35510852624.pdfIn PDF document text
- http://www.kickcommerce.com/userfiles/file/guwawu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+go+joystick+hack+ios+2021PDF 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_off0000bdd8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDD8	17572 bytes
SHA-256: `4bcdae2e5dba5569a3782e49e7d1c454d63b42a11bfbd1b509f29d461a30d8bd`
`font_01_sfnt_off0000ebc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBC1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000103d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103D8	11164 bytes
SHA-256: `147ca15a3d35175a2898879b209ee7464e6d50c04e23363faae5b53ef8784cea`

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