PDF malware analysis — malicious · 63d9d922974befb6

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 08:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 03582c80f979aa27d8c56b658e4f0a74 SHA-1: 86fbd808f8a26447fd8941864309062fd9ca2579 SHA-256: 63d9d922974befb6994cbea00110154a7cf4e4c6c3fff3d0c50492033adfae73

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains, suggesting an attempt to manipulate search results or distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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 http://www.multigacos.com/admin/uploaded/fck/file/deguz.pdf In PDF document text
- https://maurinet.com/userfiles/file/2548479132.pdfIn PDF document text
- https://curvy.tw/upload/files/81647935085.pdfIn PDF document text
- http://sushistoryus.com/uploads/files/1015154934.pdfIn PDF document text
- https://konteshamamotu.com/userfiles/file/digepefogezudu.pdfIn PDF document text
- http://evo-models.com/uploads/userfiles/files/14580871434.pdfIn PDF document text
- https://taichielite.com/louis/taichi/ckfinder/userfiles/files/xafupusijexi.pdfIn PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9q88ie27faumtjcil7eg59emct/78213887632.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6099c2d9bea640e5a2fca7b34401e92e/90061868699.pdfIn PDF document text
- http://yejiya.com/userfiles/file/76569923830.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4b9efe42---11353241700.pdfIn PDF document text
- http://flairpens.ru/uploads/files/didibeze.pdfIn PDF document text
- http://khodahoanglang.com/admin/webroot/upload/image/files/dajopomulunaxufaduzuponor.pdfIn PDF document text
- https://viveironativodevicosa.com.br/ckfinder/userfiles/files/52537773517.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/fuwilatawatebuweretamu.pdfIn PDF document text
- http://www.jacenter.org/js/ckfinder/userfiles/files/kurutawodipunakum.pdfIn PDF document text
- https://ckmandarin.com/uploads/nebumiluxozatasevarige.pdfIn PDF document text
- http://hejia-ele.net/upload/7344652118.pdfIn PDF document text
- http://regiapart.si/uporabnik/file/35261919335.pdfIn PDF document text
- https://gitedu.in/ckfinder/userfiles/files/31097765464.pdfIn PDF document text
- http://phdpecs.hu/userfiles/files/42321811387.pdfIn PDF document text
- http://jcpingie.be/public/files/titudananagixasirirules.pdfIn PDF document text
- http://446888.top/userfiles/file/49429839631.pdfIn PDF document text
- http://tlca.com/Content/uploads/files/perodekimavewuzinapadob.pdfIn PDF document text
- http://archifolder.com/userfiles/files/metebamalamosuzuwinemij.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=peter+rabbit+the+runaway+full+moviePDF 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_off0000b58f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB58F	17220 bytes
SHA-256: `171953b92f2ee9e756108e09a849914a1fc4e868bd96f26d706fade22caadb48`
`font_01_sfnt_off0000e15d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE15D	10816 bytes
SHA-256: `7d2b2f4d4571c2d9cbe1e25ddf1680a420fc2b762bd7cb11a7f4aaa91aa58cff`
`font_02_sfnt_off0000fa30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA30	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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