PDF malware analysis — malicious · 163ee28b4a70142f

MALICIOUS

PDF

78.0 KB Created: 2021-10-05 20:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: e39427cbf1680dd2d0a2f4b0afb0dcf9 SHA-1: 8a706a390f30fa26288e17d73ab158ae2b792029 SHA-256: 163ee28b4a70142f847802c7eba746d1c978ac6b7ea6f62efc857c13aa782fb2

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

Nyx PDF Classifier malicious score 0.7431

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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
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://crysiq.ru/uplcv?utm_term=how+to+find+residual+calculator PDF link annotation
- http://builderall.info/userfiles/file/romuxaweluxegoretu.pdfIn PDF document text
- https://hebatkeren88.com/contents/files/vipexuzikovotep.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1fcd20e79---memisebaxufemeli.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///jexasotawunij.pdfIn PDF document text
- http://zamaro.info/images/fcke_files/file/84045853557.pdfIn PDF document text
- http://msiutilities.biz/documents/nolazupebokirok.pdfIn PDF document text
- http://jph.kr/userData/ebizro_board/file/86383172299.pdfIn PDF document text
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d348ec213d11fc0be3532913796a823c/ruvabiwononusiwajuxaw.pdfIn PDF document text
- http://cateringkieuan.com/uploads/userfiles/file/wiwugagefonujupezinosa.pdfIn PDF document text
- https://fasaac.org/temp/files/39925528768.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e335195d76aed64d28a5bd3307f5f2de/ruvuxazivimizesa.pdfIn PDF document text
- http://qdcmd.com/data/files/zatokuforajenutelofinukan.pdfIn PDF document text
- https://suacuasathcm.com/uploads/files/12562676102.pdfIn PDF document text
- http://gwynnoak.abwingsmd.com/uploads/files/78267741231.pdfIn macro / runtime command snippet
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613611d624a58---jefabesejinijeg.pdfIn PDF document text
- http://phoiinnhiet.com/images/uploads/files/selozurosuxejenasopolet.pdfIn PDF document text
- https://medpressa.ru/files/file/64982390619.pdfIn PDF document text
- http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xodikapixisup.pdfIn PDF document text
- https://history.tlshaa.org.tw/ckfinder/userfiles/files/devubawupubatunosizuves.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c68aa0180eb51dc0223979b829a11d7e/71716368980.pdfIn PDF document text
- https://marikakozmetika.hu/editor_up/84341523526.pdfIn PDF document text
- http://kyochonbuenapark.iorderfoods.com/uploads/files/68904332054.pdfIn PDF document text
- https://hoya.mobioptika.hr/UserFiles/file/fofikirotivevu.pdfIn PDF document text
- http://nickelsgrafikdesign.de/ckfinder/userfiles/files/35167702858.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000da1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA1D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f22f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF22F	20700 bytes
SHA-256: `9a55cc8faa48a928ebba2a7cf994e3c778813a5398e6a07947dda41827934eeb`

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