PDF malware analysis — malicious · f35fadd00e5fa5be

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 21:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b6107d87f2d59f4d4f1e05c576a8613c SHA-1: 51b1bf6242afc2c3e667621aa1f690d611c36ae6 SHA-256: f35fadd00e5fa5bef3b22113c020af9eb84923633d4e84b677202c7941ea4447

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are probably used for phishing or distributing further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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=convertidor+de+pdf+a+word+mac+gratis PDF link annotation
- http://mundori.com/js/ckfinder/userfiles/files/1128134287.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2vkavhuhn2d3k8ugh6p9dskqvv/mazukowelewifu.pdfIn PDF document text
- http://navigator-nsk.ru/userfiles/file/jesuxirosikafimi.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/66pq4hl438n9phifhum3ddl6m1/lumodudo.pdfIn PDF document text
- https://ekaplast.site/admin/ckfinder/userfiles/files/fuzimozedepajekalaxomeb.pdfIn PDF document text
- https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f8a4ca5db3c0fa432fdbbafa71bdded0/60982756005.pdfIn PDF document text
- http://tcyy88.com/userfiles/file/2021090305245773499.pdfIn PDF document text
- http://traiteur-ribot.fr/userfiles/file/waladadevalojiniwulipe.pdfIn PDF document text
- https://dichvumoinoi.com/ckfinder/userfiles/files/tafid.pdfIn PDF document text
- http://coniperfumes.cl/js/ckfinder/userfiles/files/nodevawamepiwegi.pdfIn PDF document text
- http://eco-versute.com/app/webroot/ckfinder/userfiles/files/60733401773.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c4508ccb81f911d008fb6d9981d95692/vewakoziribefef.pdfIn PDF document text
- https://senesi-sklad.cz/userfiles/file/vedawavosofafigadumizefor.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a668b33e18b---7291891571.pdfIn PDF document text
- https://thai-airpark.com/ckfinder/userfiles/files/fufepagedoz.pdfIn PDF document text
- http://stin-verdon.fr/assets/Image//files/1232573723.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/buis7t4842uvpco7o6pptat9k6/30239119003.pdfIn PDF document text
- https://parkettworld.com/upload/files/27032156503.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/buobbbf9ectvljcn1921qsn5v3/sisefipuwexerazewon.pdfIn PDF document text
- https://aimhc.com/userfiles/file/zukajokulosikisag.pdfIn PDF document text
- http://sportingclubalbinia.eu/userfiles/files/77337712182.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16114a489d2321---donedigemapipokoget.pdfIn PDF document text
- http://eca.or.th/ckfinder/userfiles/files/69631349898.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0rkedejkjtt0qou1sulhesnfu2/jatakagusimuxilumapebejom.pdfIn PDF document text
- https://glbtrader.com/userfiles/file/monazuregakatuke.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d869462af47---62373107957.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_off0000de85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE85	11100 bytes
SHA-256: `3eda6db8cf62d24ebb27add68427fefdd63a0deb65b055f21dfa8eac6e15112c`
`font_01_sfnt_off0000f856.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF856	17608 bytes
SHA-256: `75244ffd23b574223611e3148d54253643128e7a0edf1365c9690ebbede5d943`
`font_02_sfnt_off00012632.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12632	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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