PDF malware analysis — malicious · 6b8d5d622b48ce86

MALICIOUS

PDF

80.4 KB Created: 2021-10-09 05:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 44ecf6d0e1a3e496075beb98fcdc8584 SHA-1: ba105533308a1178962717af92918bb3eb914966 SHA-256: 6b8d5d622b48ce863cc444d156959e48eb217d0ff548acd027f682d41e52ef48

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities, contributing to the phishing and potential malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.7970

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://barefoot.pl/userfiles/file/tatemurod.pdf In PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a543876ed---pusojivigez.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16153389285a58---mepizute.pdfIn PDF document text
- http://prakseologia.eu/userfiles/file/kugesasixekemimatatogen.pdfIn PDF document text
- http://ebslang.net/_UploadFile/Images/file/6702838100.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f76812b06---18567685963.pdfIn PDF document text
- https://rocha.pt/userfiles/file/38956795345.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/i95t5l0sdvvtt1bfgn6157foij/mokijexatatafovota.pdfIn PDF document text
- https://thuhuonglacquer.com/uploads/news_file/zelebipesozov.pdfIn PDF document text
- http://www.llmhospital.com/www/js/ckfinder/userfiles/files/91769033078.pdfIn PDF document text
- https://myclubowners.com/userfiles/files/luwikakuwaxefisuxi.pdfIn PDF document text
- http://purofirstli.net/userfiles/file/60758346223.pdfIn PDF document text
- https://tavcam.com/upload/ckfinder/files/ritipaginovovari.pdfIn PDF document text
- http://avandcie-energy.fr/ckfinder/userfiles/files/82187452513.pdfIn PDF document text
- http://tarnava.eu/user_images/file/54194299856.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/dosefusuvu.pdfIn PDF document text
- http://ymmicro.com/files/files/63376834572.pdfIn PDF document text
- http://gleb777.com/fck_upload/file/finusufubalebakuwaf.pdfIn PDF document text
- https://lemondedelaura.com/userfiles/file/67784676160.pdfIn PDF document text
- https://vnmmalta.com/userfiles/file/pifamelixapexam.pdfIn PDF document text
- http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebc2514e84---26142214377.pdfIn PDF document text
- http://le-bouquet.be/userfiles/files/sabuten.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=human+anatomy+lecture+notes+pdfPDF link annotation
- 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_off0000ddea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDEA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f601.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF601	10896 bytes
SHA-256: `09227ef2a6177df04341af3522e2bd548e9d2b7caffea66d039b19154c6b0d81`
`font_02_sfnt_off00010f38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F38	19464 bytes
SHA-256: `6531025444507706c1683ce633ebc5b2599b260a1cb55699c8ef1b0b6874cb1f`

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