PDF malware analysis — malicious · bc4205c2f8b23d6d

MALICIOUS

PDF

89.1 KB Created: 2021-09-03 10:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e91ae3ab2bf4d60ecc0dd241422835ce SHA-1: 574658c8f2526843a6f5ca136c6d5baeb17629e8 SHA-256: bc4205c2f8b23d6d4a07e56c1c9ee27ee0405b1b02fc33c503d2fb4b7b55099d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://hiroyoung.com/data/files/nolixadaguwakamusifozal.pdf In PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/705c9ef51c9c090b120483492d6986b8/61130275543.pdfIn PDF document text
- http://mirai-kankyo.com/userfiles/files/rozudilepa.pdfIn PDF document text
- http://joewhitefamilysite.com/clients/59967/File/pivojipax.pdfIn PDF document text
- https://cr2tek.com/userfiles/Proj_Name//files/38370955873.pdfIn PDF document text
- https://cahayamimpi1.com/contents/files/vibafadowomajom.pdfIn PDF document text
- https://biblioteka-koneck.pl/ckfinder/userfiles/files/wuruge.pdfIn PDF document text
- https://mayphoviet.com/media/ftp/file/99189552637.pdfIn PDF document text
- https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/k0hnoa4qesd57ofp2ofs551603/15799093243.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c9a9328681e7d318b701fc0ce063d9c0/70946571254.pdfIn PDF document text
- https://servicepapik.ro/files/matak.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b164a13e4fb---49196639531.pdfIn PDF document text
- http://jjmcp.jp/userfiles/Image/file/zawagufasavuziwidan.pdfIn PDF document text
- http://nhs1980alumni.com/clients/878257/File/76647914976.pdfIn PDF document text
- http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8c8c1dae---23399322409.pdfIn PDF document text
- http://proclima-membranes.ru/userfiles/file/jajalebejimusire.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726d399f37a---59722925713.pdfIn PDF document text
- https://dovolena-jiznicechy.cz/uploads/14878443272.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098299690586---12782851003.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b9f6d49b---nefata.pdfIn PDF document text
- http://www.udelimpa.es/ckfinder/userfiles/files/70556904161.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/873ed8e4c0962b64fd4880c21bafbf2e/vokan.pdfIn PDF document text
- http://chukgoobok.com/files/fckeditor/file/tusatus.pdfIn PDF document text
- http://dietmoiquangle.com/webroot/img/files/25286956784.pdfIn PDF document text
- http://ssatripoli.org/userfiles/file/lanigilitudova.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=exercices+terminale+s+nombres+complexes+pdfPDF 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_off0000efb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000107c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107C6	20172 bytes
SHA-256: `e3e563343bbb2f65bd12430b38e84a6facb97262bf14d9ef3c8b1f467187239f`
`font_02_sfnt_off00013b20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B20	11004 bytes
SHA-256: `3519fb7b989702fd649d587cab7884a546f52735b60cc0d1a38db5654cde90bc`

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