PDF malware analysis — malicious · eb6658bb4ee185e3

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 23:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: cd3d9fec13437e748edbaba4e41162c4 SHA-1: 5b5acfc411db2d5e571767fe25716c01adc17dd5 SHA-256: eb6658bb4ee185e3f0fedf70883e5de53e44c5e23e957bd89f5ae2bf10a4996f

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking. The document's structure and embedded links strongly indicate a phishing or malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://inwebjor.ru/uplcv?utm_term=best+room+measuring+app+android PDF link annotation
- http://allamericannursing.com/userfiles/file/38068505080.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416baa4a50b---86273154111.pdfIn PDF document text
- http://emblem4home.com/UserFiles/Member/File/12969710344.pdfIn PDF document text
- https://prospr.fr/ckfinder/userfiles/files/23050234260.pdfIn PDF document text
- http://klm-co.ru/foto/ck/files/lirokevi.pdfIn PDF document text
- http://www.masozilina.sk/ckfinder/userfiles/files/60276473487.pdfIn PDF document text
- http://fandimnarodaku.cz/upload/file/51504360982.pdfIn PDF document text
- https://vyrukrc.lt/userfiles/file/xazijofesipumitupumezopud.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415fcd9035f---dogibobu.pdfIn PDF document text
- http://hawaiianhunareiki.it/file/nilatatepevepasobuxoda.pdfIn PDF document text
- https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/77241070659.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0fe74249---70592456834.pdfIn PDF document text
- http://2015.letnifestiwal.pl/ckfinder/userfiles/files/43193138543.pdfIn PDF document text
- https://songhongresort.com/img/files/96174362.pdfIn PDF document text
- http://videocycling.info/files/file/vevevusigexozo.pdfIn PDF document text
- https://parklanehotel.asia/userfiles/file/zuvogiruvevitazamosasud.pdfIn PDF document text
- https://idealist.ro/userfiles/file/vonemasobotejem.pdfIn PDF document text
- http://getsolarny.com/userfiles/file/5176190743.pdfIn PDF document text
- http://fiumevivo.it/userfiles/files/tulolebebezap.pdfIn PDF document text
- http://rjt1.org/upload/files/89621269785.pdfIn PDF document text
- http://corporatiegids.nl/uploads/files/90501192581.pdfIn PDF document text
- http://icoenergia.com/userfiles/files/difilomovafezekupipufik.pdfIn PDF document text
- http://sujitonweb.com/userfiles/files/35024079280.pdfIn PDF document text
- http://studiomalpocher.it/userfiles/files/3618080253.pdfIn PDF document text
- http://hockjoohin.com/admin/uploads/file/9178156370.pdfIn PDF document text
- 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_off0000dca2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCA2	10844 bytes
SHA-256: `650577733e944c5b939bf25ceffb349922379d1c94c078105f8fdb727a1022c7`
`font_01_sfnt_off0000f57c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF57C	18148 bytes
SHA-256: `3c65422267b7365e76448a183780dc8a832874d3d18b80a478d32bf88effabb2`
`font_02_sfnt_off0001251d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1251D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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