PDF malware analysis — malicious · 5862e533e24c3fee

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 23:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 94f84d3a7d9920eb52d6e804aacdb881 SHA-1: 8a8132144252083c0b354a8940c4d637d86cee6e SHA-256: 5862e533e24c3fee6f0bd48b67fcc96806c625c9546d547bab97f0dda5f3d4a5

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=diagram+of+frontal+rainfall PDF link annotation
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313f9af3e4d---78194413073.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342fc01c816---pewuz.pdfIn PDF document text
- https://polaria.cz/images/file/jedebosobozuvetagew.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429c31d52d6---65211827887.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vfuo3rv1u4ktr0go8um1093eb6/40670014254.pdfIn PDF document text
- http://aaronandanthony.com/userfiles/files/makerezilapuz.pdfIn PDF document text
- http://ave-france.com/pics/files/nenuwiposuzozozoxo.pdfIn PDF document text
- https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/juzisedujiduvagofofosow.pdfIn PDF document text
- https://pirkitpadangas.lt/ckfinder/userfiles/files/fokojupo.pdfIn PDF document text
- https://camping-du-lac-dijon.com/userfiles/fichiers/84126453084.pdfIn PDF document text
- https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fonojuzuzo.pdfIn PDF document text
- http://hifitness.hu/userfiles/file/zilasarabepoxajavozexoji.pdfIn PDF document text
- https://plewmal-d.com/Uploads/files/99993268872.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/7290953145.pdfIn PDF document text
- http://xn--h1agcmh.com/ckfinder/userfiles/files/xevaxodopupalitobajub.pdfIn PDF document text
- https://gullyracing.it/admin/ckfinder/userfiles/files/juxagijurowirakano.pdfIn PDF document text
- https://mycocoa.org/images/upload/files/vibikojegazowenubegipoku.pdfIn PDF document text
- https://tractorpulling-emmeloord.nl/upload/file/vemijiwewobikewuf.pdfIn PDF document text
- http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/koxobifebigeluduxidaziza.pdfIn PDF document text
- http://3suntech.com/UploadFile/file/20210914082433307.pdfIn PDF document text
- https://yaofangpeixun.com/upload/files/jutezosurag.pdfIn PDF document text
- http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/zosopanugulofozib.pdfIn PDF document text
- http://theclelandgroup.com/img/upload/file/10229112621.pdfIn PDF document text
- https://seltec.io/images/uploads/files/10596368189.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132be2bdc499---70021414733.pdfIn PDF document text
- http://schule.havonix.com/ckfinder/userfiles/files/66390608880.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_off0000d63b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD63B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE4D	18408 bytes
SHA-256: `b8a710343b40dfb2435fde34eb60e8b89121d32c0f92c944f8219169e49682c3`
`font_02_sfnt_off00011db8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DB8	10256 bytes
SHA-256: `a6269403a600f6dfe79933c56c8924eea9d3828ef1c69aeef66ed44bb4116498`

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