PDF malware analysis — malicious · d541399714b926ed

MALICIOUS

PDF

89.6 KB Created: 2021-10-10 10:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 131c103b31e403b1675574acdab20fc0 SHA-1: 1e9aea5db18716b5f242d87fcc8f4e431019b3be SHA-256: d541399714b926ed5188c091c0f8bf7a2b6c6d75069da7982438056bc41390e7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16a6e22ca---60873726582.pdf In PDF document text
- http://titusauto.hu/kepek/file/12360061658.pdfIn PDF document text
- http://birnagarcollege.in/userfiles/file/runokopaxak.pdfIn PDF document text
- http://imhome-listings.com/userfiles/files/tidurimebox.pdfIn PDF document text
- http://jatechkj.pl/upload/fck/file/91244443076.pdfIn PDF document text
- https://mertlakustika.cz/images/pages/file/50303610826.pdfIn PDF document text
- http://crocepadrekolbe.it/userfiles/files/jevasebujalilejegowas.pdfIn PDF document text
- http://sherwoodchambergolf.com/ckfinder/userfiles/files/14523545543.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615424f6614ca---badafowax.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/f2831q1gcgp3i01lgv0l3dp9r5/10964039043.pdfIn PDF document text
- http://prestopc.it/upload/file/97543450477.pdfIn PDF document text
- https://n-tlg.com/files/file/34432736856.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16157f7f635b21---26407112632.pdfIn PDF document text
- http://parejalecaros.com/adjunto/upload/fck/files/fopatavesanupixijanez.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f986108311---widanepotiwite.pdfIn PDF document text
- https://vresponse.net/userfiles/file/27098576081.pdfIn PDF document text
- https://sunridgecorp.com/uploads/files/202109071013467934.pdfIn PDF document text
- https://www.adoz.cz/ckfinder/userfiles/files/buvotesekuwovatu.pdfIn PDF document text
- http://www.egavilanes.com/ckfinder/userfiles/files/vuxejinogakikevi.pdfIn PDF document text
- https://radekslodkiewicz.pl/files/file/66671113364.pdfIn PDF document text
- https://gberwanda.com/gbe/useruploads/blogs/files/73380265214.pdfIn PDF document text
- http://mmbc.cz/_data/user_files/file/81806764893.pdfIn PDF document text
- http://opersan.com/file/71444704376.pdfIn PDF document text
- https://novinfasteners.com/userfiles/file/83607823196.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/qfm2bre7f68val5h556qoo3nc2/nijufujubagujamomulivuk.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=british+contemporary+composersPDF 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_off0000f5b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5B5	10760 bytes
SHA-256: `4c46a6469debaaac64a5983a8b28ff194eb48044e2ec15c10655f4b829f7a1ff`
`font_01_sfnt_off00010e62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E62	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012674.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12674	19288 bytes
SHA-256: `862ff4d3cfad12b52d5d10968e7a926cb9d8686465b9f47fe65568614f826a54`

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