PDF malware analysis — malicious · 6e79d3481c52a6c0

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 16:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f15d96a70d3ade085d6901a402624a53 SHA-1: 5e18aa1e404dbe9bed461373990d9adb6f44aa9c SHA-256: 6e79d3481c52a6c05e504b98894a1f40867ee8bf2e190552650a1bbd64fc1df7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 5

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://laborke.ru/uplcv?utm_term=ifrs+13+pdf+francais PDF link annotation
- http://sushimura1.com/uploads/files/medijomozuruneduvuredaw.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/seun51uf7lk25ksmh9ntdlb5d3/76122186333.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847200641d6---6466552033.pdfIn PDF document text
- http://ledspectrumthai.com/ckfinder/userfiles/files/73737400674.pdfIn PDF document text
- http://spreewaldatelier.de/img/editor/file/bukitak.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117222badf5b---vozukoxeberawaduvosubewos.pdfIn PDF document text
- https://przyklejki.pl/userfiles/romomemilufaze.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0a614196a47205591ef55ecdb58c83f1/14319710531.pdfIn PDF document text
- https://vayoto.vn/userfiles/file/mukivowilafigenexe.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8488784c10---warukopi.pdfIn PDF document text
- http://jamessham.com/admin/usercontent/file/77696559961.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/52nrva99hqk0a7ukmu9faale52/webezobipunuku.pdfIn PDF document text
- http://laiyi-art.com/userfiles/file/gijoxedemegabixodut.pdfIn PDF document text
- http://abwmountvernon.com/uploads/files/davovuruvitiresat.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4e7b256e---zimipenovefobasevivero.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bada23667f8---22076307772.pdfIn PDF document text
- http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/57227603967.pdfIn PDF document text
- https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
- https://27061010.com/uploads/files/202108260732459060.pdfIn PDF document text
- https://autoteam.in/ckfinder/userfiles/files/sinemukafuwurat.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a785262ad63---8575350138.pdfIn PDF document text
- http://parfumerieindex.nl/images/uploads/45004661554.pdfIn PDF document text
- http://ufnk.fr/app/webroot/files/file/wagesezuzaxelijexoruv.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jnhpm9ludvqjufqcclpoj5ggu2/gedudukodulowofevo.pdfIn PDF document text
- https://pakistanchristiancongress.org/userfiles/file/kazulofiwam.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_off0000c1fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1FA	18464 bytes
SHA-256: `dca4638c634ab752c45359fa9febdfeceb9c1c4f3d323c03914828fed8f0143a`
`font_01_sfnt_off0000f1b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1B0	10392 bytes
SHA-256: `00d8ca8dd6c4e1a93c5c0195e23fb307c2451da62ba5530d9d8f05330362a2a5`
`font_02_sfnt_off00010954.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10954	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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