PDF malware analysis — malicious · 3d4fc83a25f66058

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 08:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 799b7afd39b727f3c85c52fcb7b08786 SHA-1: 449fb053b616f791b640c8423fdec846d533f448 SHA-256: 3d4fc83a25f66058818e972bb9699ff178637d77452d3f4993e96fdbaa314034

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing traffic to potentially malicious or phishing content through a network of disguised URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.6314

Heuristics 5

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.
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://yourbuilding.ru/userfiles/files/88847762849.pdf In PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078692e9b43d---naranigemuwufemewod.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e4fd75c49---rapelivajitefivorusibonix.pdfIn PDF document text
- https://esprimagroup.com/userfiles/file/bujuzituv.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d380b1bcd---wonixinaviwoweju.pdfIn PDF document text
- http://boschvietnam.vn/files/usersfiles/files/nenexibuwuvozuk.pdfIn PDF document text
- http://shophouse.info/images/files/nigejebixadowabepidun.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530f4803f2---45741795073.pdfIn PDF document text
- https://condicionamentofisico.com/arquivos/file/pexulugibofun.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8b658a8cde6a3c6efbe5b53626cd76f/pajuxogidewuzuvab.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6f919df0446e6cb5925a862676a87f7a/20471184207.pdfIn PDF document text
- http://revucue.com/ckfinder/userfiles/files/ximagawabavitafimarab.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16105f0624726f---nadanapemi.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074363a7de98---89503753807.pdfIn PDF document text
- https://sgotomotiv.org/upload/files/28600670815.pdfIn PDF document text
- http://banglatalkies.com/dynamic-images/cms/file/xipabemunarakexapamuvifa.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1b284a9e---93948058721.pdfIn PDF document text
- https://okvino.it/file/20103030732.pdfIn PDF document text
- http://kassa.pl/userfiles/file/85529814851.pdfIn PDF document text
- http://jshanwoo.com/ckfinder/userfiles/files/jogisadekivifidexejewobiw.pdfIn PDF document text
- http://africa-emergence2019.com/userfiles/file/tesuminufafusap.pdfIn PDF document text
- http://sistersaviopublicschool.com/userfiles/file/banukuvanupe.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f43b22189---76904672577.pdfIn PDF document text
- http://improntediteatro.it/userfiles/files/21990564343.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=clue+search+puzzles+nutrition+answersPDF link annotation
- 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_off0000ebfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBFD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010414.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10414	10748 bytes
SHA-256: `e16188993aa8b72a550844e4ad04c286c4d7a0e35253692d863b7b58088df795`

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