PDF malware analysis — malicious · aa3db473a9d26e52

MALICIOUS

PDF

66.3 KB Created: 2021-09-28 11:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: de86b887d7c5a956f6196e52b0e32518 SHA-1: dc900d96ca3d6987f2157c8636276aa52c5b170d SHA-256: aa3db473a9d26e52f7edc510ca6ef6b7426f05bb19b987b42e8b9c9604d0d04d

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

Nyx PDF Classifier malicious score 0.6039

Heuristics 6

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
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://eva.am/files/10161e9bdb1d8f4d.pdf In PDF document text
- http://vocal.bpv.su/content/files/files/guwegedarediluwomosapi.pdfIn PDF document text
- http://hit-air.pro/ckfinder/userfiles/files/jiwalonujufamirekil.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161392fa940983---visevaj.pdfIn PDF document text
- https://topupdana.com/contents/files/gopapenegejupowagigetux.pdfIn PDF document text
- https://pcparts.fr/ckfinder/userfiles/files/xetonomegeto.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/23c2866572f19fa75dde92c76308eff8/58327228341.pdfIn PDF document text
- http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/25669607891.pdfIn PDF document text
- http://sun-green.eu/ckfinder/userfiles/files/bonilofurumafa.pdfIn PDF document text
- http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poselimepabafuvaliwaba.pdfIn PDF document text
- http://taemyung.com/data/upload/file/gimamulozifisabotep.pdfIn PDF document text
- https://marblobath.marblobaths.ph/app/webroot/img/files/regufutivajixadam.pdfIn PDF document text
- http://terwaarde.be/ckfinder/userfiles/files/93899282523.pdfIn PDF document text
- http://mocphatreal.com/assets/images/ckfinder/files/zobepewerugitosef.pdfIn PDF document text
- http://swotaweb.com/img/upload/file/radonuf.pdfIn PDF document text
- http://shiinamotors.com/js/upload/files/pizenemumajemi.pdfIn PDF document text
- https://xn--atpta-nfb.lv/images/userfiles/files/wigetusoro.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146336b1b7e8---dosak.pdfIn PDF document text
- http://spakimthi.com/upload/files/2335354578.pdfIn PDF document text
- http://ukwoodrecycling.com/userfiles/files/nunarukamopulupinuzininuw.pdfIn PDF document text
- https://inks.bg/userfiles/file/65184318868.pdfIn PDF document text
- http://baharev76.ru/userfiles/file/karopewopezuwoki.pdfIn PDF document text
- https://dakhoathienhoa.net/images/files/nosera.pdfIn PDF document text
- http://lev-steklo.ru/userfiles/file/fibugelojagulo.pdfIn PDF document text
- https://rajaketiga.com/contents/files/radedudukozijobot.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hug+day+shayariPDF 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_off0000b27f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB27F	16688 bytes
SHA-256: `3c640931fc9cde1e8b375cadc82fc670e770a13932f731f9d822edbe98858be0`
`font_01_sfnt_off0000dd36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD36	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f54d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF54D	10232 bytes
SHA-256: `4ffd7862eb82150e67c93355a773cc18aed508f76a8d3dae4d2190675bae83a9`

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