PDF malware analysis — malicious · 5d2734353c1e90d1

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 18:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: dc8e0ab1c61bc22374c58eb35a8d7217 SHA-1: 3ca130cd2ba0c2397a9b036ebd025e7803486ad9 SHA-256: 5d2734353c1e90d1ccd6b57a2a664953659e165d96834f9a80a9b262e5854bf8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains, likely for credential harvesting or further malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/71994948691.pdf In PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/s8k9nk85tul0em0fdbpu3ggb80/lizoborogadebetikegito.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r31bpaa0u7p2vs1f3d9vluosv2/jejadupis.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8f355b11---90427356373.pdfIn PDF document text
- https://mamo-tato.ro/userfiles/file/5136527735.pdfIn PDF document text
- https://asset-books.com/userfiles/file/ximorifikavagogizepa.pdfIn PDF document text
- http://www.malagatour.es/ckfinder/userfiles/files/pepiraxopaxuku.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610477a4b8329---69221164757.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761db3b94fe---81519599412.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aca608041---42305143793.pdfIn PDF document text
- http://codemessaging.net/ckfinder/userfiles/files/vomaratavufiv.pdfIn PDF document text
- http://tysons-cafe.com/uploads/files/90451416478.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1610da037f165e---vizosujodaxuduwozo.pdfIn PDF document text
- http://iphysiology.ru/upload/99674714678.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8i6cc0tidskebpohd5qi25es47/dekege.pdfIn PDF document text
- https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/lofupitujojufajivo.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/8grnj50tqg4538lq303b7u9r41/xomazo.pdfIn PDF document text
- http://jplus-ag.com/upload/files/BodyFile__60C855BF35812.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f5003c84c---41335184700.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa03697f2---52243141722.pdfIn PDF document text
- https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2rphr8r430gvu5f2u2lqqdjl11/wamuxabasisabiwepu.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b66e36a22---lulevikapefonojimolegok.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c946172836---rudiledoguxa.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/512f4356809bd7d2a4bee0ca1739d9cb/85020338344.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/35cc539098540c2e8441a1da10d50a7a/10235804700.pdfIn PDF document text
- https://agroadvanced.com/app/webroot/newsletters/editor/files/23514667304.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cadena+de+valor+de+un+restaurante+pdfPDF 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_off0000ef61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF61	10596 bytes
SHA-256: `4c540f0f67e729001142e4b1702a23317b91515dd269dc2418fe012503dd743d`
`font_01_sfnt_off000107c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107C9	17716 bytes
SHA-256: `94bc237b172b4b45ec825fbd3f1d63f36678e2e6d9362543bc273eca3d408996`
`font_02_sfnt_off00013453.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13453	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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