PDF malware analysis — malicious · b434f0a0a1b28a98

MALICIOUS

PDF

72.7 KB Created: 2021-09-10 15:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6655f9d9fc22c459a8c57d032dc0d5a5 SHA-1: 956f9aebd42291a2018f37e0f5c3cc1a93c34596 SHA-256: b434f0a0a1b28a98ff8ffa622f7b212d8ca87320c5186736249c34ceffb60c4e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended, likely delivered via a spearphishing attachment.

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://tjpapigroup3.com/contents/files/85782879472.pdf In PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39ea4308f---78087133838.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a83c65f94d1af6432e2ebeed98e48b5/65731704858.pdfIn PDF document text
- http://fashioneducation.ru/userfiles/file/7202440903.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/53b38ce4eff8766154e36509feca4df9/64539335407.pdfIn PDF document text
- https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a4e6c279684e47ced76e09fc8e3ffc91/17113971622.pdfIn PDF document text
- http://ibarugi.com/fckeditor/userfiles/file/6072574307.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bikumozubudubusor.pdfIn PDF document text
- https://lomasdelaweb.com/userfiles/2008.09/file/kuwipowaxodawerumesu.pdfIn PDF document text
- http://munnarinfo.in/userfiles/file/22099197684.pdfIn PDF document text
- http://forter.vn/hinhanh/file/xojelofatenowoj.pdfIn PDF document text
- http://le-nora.com/userfiles/file/zagunobugadokumipinoliv.pdfIn PDF document text
- http://mylivediamondinventory.com/uploads/files/68734399194.pdfIn PDF document text
- http://ceraunavoltapizzeria.it/userfiles/files/ravononopogagi.pdfIn PDF document text
- http://ieeepes-thailand.org/app/webroot/files/files/34711704786.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/39004116314.pdfIn PDF document text
- http://lycee-elm.com/userfiles/file/sijafiganolawamusoruput.pdfIn PDF document text
- http://around-sicily.net/userfiles/file/nojetamuzo.pdfIn PDF document text
- http://fuzoku-kyujin.jp/ckfinder/userfiles/files/67101286069.pdfIn PDF document text
- http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/kovikefijofudunego.pdfIn PDF document text
- https://podiummagazinenews.com/ckfinder/userfiles/files/96419801427.pdfIn PDF document text
- https://playindiano1.in/ckfinder/userfiles/files/50306094214.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/063896d42e0bb671e4f70431108235f5/xubetimikub.pdfIn PDF document text
- https://perkunasstudio.com/uploads/files/202109010718145689.pdfIn PDF document text
- http://hongdacable.com/d/files/jebazuwogufuverufo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=youtube+downloader+app+for+android+phonePDF 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_off0000b9b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9B9	10736 bytes
SHA-256: `61c5a1b1d3ccce1979b7ee2b5bcb4d44f200128d3d99f794f2a4325e1b446fcd`
`font_01_sfnt_off0000d220.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD220	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ea32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA32	16940 bytes
SHA-256: `1eaf3491e8c0219750a70b6fe9c499a80b65ab57228d5905099c6823546f3464`

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