PDF malware analysis — malicious · f54f54b8cf661c78

MALICIOUS

PDF

90.7 KB Created: 2021-09-08 09:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: fc341b458a1de15a296e3be09588b75a SHA-1: 7feff7e78d3237c13a310c5df2a50c1765d25fb9 SHA-256: f54f54b8cf661c78570e7b6ab21030a8ff7a679f048497c422feb7d5ccf19399

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier strongly indicated maliciousness, and the presence of multiple external links suggests an attempt to redirect the user to potentially harmful content or phishing sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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://queure.ru/uplcv?utm_term=vocabulary+for+ielts+collins+pdf+free+download PDF link annotation
- http://www.larucheapain.fr/ljk/file/fawivetunokafowadopola.pdfIn PDF document text
- http://www.asslar.de/downloads/gegogop.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4db2a9789b---63370028414.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/xosixevanolesodutilirig.pdfIn PDF document text
- https://leanuslab.com/UserFiles/file/47587273909.pdfIn PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/b1binfjqvm3fr5e828f1irb2k7/zobureg.pdfIn PDF document text
- http://agnieszkapawlik.com/userfiles/file/ganoxebujafisenuleweguv.pdfIn PDF document text
- https://ocw.tw/uploads/files/xerepugidezofeg.pdfIn PDF document text
- http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/nujonog.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111cde761381---91424851760.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/939fef5fe4c2da5aa035841407ed1782/xikebusogibek.pdfIn PDF document text
- https://rmp-familienanzeigen.de/cms/files/9583551563.pdfIn PDF document text
- http://didongsinhvien.com/upload/files/gibibafikos.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc381ac270---wetituvekamewat.pdfIn PDF document text
- https://aslimitada.com/userfiles/file/46927993616.pdfIn PDF document text
- http://boxerdapolenta.com/cmsimple/images/file/50525003527.pdfIn PDF document text
- http://www.deco-interieure.com/userfiles/file/fagowizokav.pdfIn PDF document text
- http://casaalu.com/luutru/files/4148901416.pdfIn PDF document text
- https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9456287e6d6d95d2d10dd87db4a6764a/jumetozokubik.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5725296b30bb2278c730cef03b06b937/96998016.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160808ac5dd84a---41472455531.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d96b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD96B	16232 bytes
SHA-256: `01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684`
`font_01_sfnt_off0000ef44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF44	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010756.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10756	23172 bytes
SHA-256: `8b923ecef5141dd472e2cc22e827e191bce4b30bedb7991b2107c91b4bce2ee6`
`font_03_sfnt_off000142e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142E9	11024 bytes
SHA-256: `9afad2731458e3e64122ebacedd721ed9c4006036d6a712cbb4e4b536b0bba37`

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