PDF malware analysis — malicious · 081e4be75f4160be

MALICIOUS

PDF

92.9 KB Created: 2021-09-21 01:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: eb928de887a1d38a7492ca4045b2e47d SHA-1: ffac6945bd670209a1241d1ee222fceb18ec17f6 SHA-256: 081e4be75f4160befffd1edd8ea05be52cf1dc71aa0cb36fc45c4d4eef4c4262

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=k+means+implementation', likely serve as lures to phishing or malware download sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9929

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://crysiq.ru/uplcv?utm_term=k+means+implementation PDF link annotation
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143253965389---2325543801.pdfIn PDF document text
- https://www.auto-ecole-acm.com/ckfinder/userfiles/files/girixudane.pdfIn PDF document text
- http://webinaris.training/ckfinder/userfiles/publics/files/6150296674.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161345c0781f63---mepotakujavudululalami.pdfIn PDF document text
- https://easy2ticket.com/upload/files/5237249364.pdfIn PDF document text
- https://kebecelectrique.com/upload/editor/file/lugepuzolilifekok.pdfIn PDF document text
- https://vietrocknet.org/app/webroot/img/files/nemiva.pdfIn PDF document text
- http://dellalontra.it/userfiles/files/17811784041.pdfIn PDF document text
- https://maytinhdalat.vn/images/uploads/files/11222669129.pdfIn PDF document text
- https://tidaksusah.com/contents/files/lasudapetarojumoxuxipox.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/dukif.pdfIn PDF document text
- https://emartdeko.pl/galeria/file/rupedugetodakagob.pdfIn PDF document text
- http://abbuffalowings.com/uploads/files/wuvasejinawasok.pdfIn PDF document text
- https://thefertilizerproductionline.com/d/files/76593599591.pdfIn PDF document text
- http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/63840853237.pdfIn PDF document text
- http://ltmetal.com/userfiles/files/11715004703.pdfIn PDF document text
- http://infoegrafica.com/userfiles/files/givewutidoliwisajak.pdfIn PDF document text
- http://grandviewgroupresort.com/upload/files/fiwejurozupoxovasaluvakug.pdfIn PDF document text
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb8fb16d05---rajisoduzikagub.pdfIn PDF document text
- http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/62355331760.pdfIn PDF document text
- http://iccjsc.com/images/uploads/files/sasowadupedil.pdfIn PDF document text
- https://upbfassadenbau.com/upload/file/wugolufupo.pdfIn PDF document text
- http://baharev76.ru/userfiles/file/raduxobewiful.pdfIn PDF document text
- https://nepalonlineexam.tisaracademy.com/userfiles/files/13601249597.pdfIn PDF document text
- https://aptitudeclass.com/ckfinder/userfiles/files/97670965671.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_off000107ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107EF	17912 bytes
SHA-256: `43a958314f853849d118ecffa59b8e9d82a16e3f4fad44488b33c27a471ae211`
`font_01_sfnt_off000136ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136EF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014f06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14F06	10304 bytes
SHA-256: `bbba88585157e2929f1ef012667840f43fcd28848e41500cbd52ffdbba418dc4`

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