PDF malware analysis — malicious · 42740a6b527f7ef0

MALICIOUS

PDF

87.6 KB Created: 2021-07-07 11:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 63c370d66b8d3258aacb162ceb7930a8 SHA-1: a2ad616ce648b0a6c88931e4c6affea440a2de3c SHA-256: 42740a6b527f7ef081ec92a2f9fbfe9756f2fa1b0c50f0ce11e4a5e9913a6db9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to external, potentially malicious, content.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/4ott1c1qg2jmo8ej5veh7fpgi0/43382067132.pdf In PDF document text
- https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/183d14e85505dc05e8791898d4cdc45d/goxunitejaruwurijonurazo.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/910c340182c9e6341439257aa174622a/12439870230.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58b529233d---61039829551.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/59cb8l8g1nvev0n2v5aek2kei0/finisa.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-6-17/20210617170633819274.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abef139bbc0---67779068309.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0aacb336565aab49819e1ee06b4e0293/vukekikusijemeripi.pdfIn PDF document text
- http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7854475894.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/webogumilejigesonafisobap.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab044439c---5166993409.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0f9aa7e84---dilegime.pdfIn PDF document text
- https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/lftnmlbppg1cvjcldohe4065n8/bakexutelixizowidobokeda.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16071d45680466---27966588893.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ie8st5ibtaiqcoak1vuc19rfl7/75851229588.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38edf019b6---65681861146.pdfIn PDF document text
- https://avigailpekelman.com/sites/default/files/file/11626763080.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc0b2069b1---nulojove.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f372bbca2c---47312879835.pdfIn PDF document text
- http://benhvienlaptop.biz/userfiles/file/96607258662.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/30e7b92b4c84a4370c8808e29dc97757/3105718916.pdfIn PDF document text
- https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/hd3nf4v7rj13clf90iht60pm28/57579164268.pdfIn PDF document text
- https://diarch.in/WYSIWYGImage/file/13690069031.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086078d8a0f5---72553014076.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=alison+pill+american+horror+storyPDF 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_off0000f029.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF029	10732 bytes
SHA-256: `0e93d7765d0a164ec2e1a2564244eb159c4693a30c256400d5d6a4212d2f35f6`
`font_01_sfnt_off000108b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108B0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000120c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120C2	17712 bytes
SHA-256: `603bebedfcce230800b825ba8eea97d520df5fa0c844c1457cfec26a9c717b6a`

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