PDF malware analysis — malicious · 543818e5a6a3f059

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 19:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 64b378ab43e1d9b78f1ea61a85123d85 SHA-1: 0cbc83180fa1c3e8c1907ee3f5c07df6416dbb3c SHA-256: 543818e5a6a3f059c2b9ded149ce0effb42450abbc036b23e909c197c7c8e241

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9094

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba31e6f86---sunenuxewuboposuzil.pdf In PDF document text
- https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1b2ee8678f230dbc10cbe9af8d6c7bf/pegarizupo.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7370c0415f---xefomopusujadasonoxilogit.pdfIn PDF document text
- http://contactconfiance.com/files/files/leraje.pdfIn PDF document text
- http://arunimaflavours.com/userfiles/file/xipije.pdfIn PDF document text
- https://senfina.top/uploads/files/rerumuvaga.pdfIn PDF document text
- https://steammining.com/userfiles/file/83453637516.pdfIn PDF document text
- http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d32b3adc---37555151511.pdfIn PDF document text
- https://didacostruzioni.it/userfiles/file/noxajazewugasuvo.pdfIn PDF document text
- http://ave-france.com/pics/files/firimonobilebigijol.pdfIn PDF document text
- https://hoavily.com/uploads/files/88241165510.pdfIn PDF document text
- http://fullx.net/files/kolavolef.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/38582fb2c3dbeaf285915a3d0cc0c974/62067099490.pdfIn PDF document text
- http://dolphindp.com/kor/FileData/ckfinder/files/20210618_1CAEDEFF888E3B09.pdfIn PDF document text
- http://classtool.info/upload/files/bosilubovape.pdfIn PDF document text
- http://ahkkpcm.org/userfiles/76689050018.pdfIn PDF document text
- http://lamay.de/userfiles/file/42912702190.pdfIn PDF document text
- https://tekmaker.com/upload/files/70350797211.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gmpviucd5ftv1v3nditv4h62s0/21702900.pdfIn PDF document text
- http://bajajsports.com/userfiles/file/96379186026.pdfIn PDF document text
- https://wfbulgaria.com/uploads/wysiwyg/files/xurexa.pdfIn PDF document text
- https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fa1431e4ef5d20921e31dc8ba15f1721/wawarisedotaxo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+defibrillation+guidelinesPDF 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_off000109c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109C2	18468 bytes
SHA-256: `a946c86183023811a37b22ea40c2109c51c538b65937698a96ec2c0520335a1c`
`font_01_sfnt_off00013a09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A09	10760 bytes
SHA-256: `eb8909c672e2482bb32787ab8d2869407b088b90046756cb43670a60185d5dfa`

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