PDF malware analysis — malicious · 67b0ade18f4437a7

MALICIOUS

PDF

62.3 KB Created: 2021-09-16 05:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 98603701565a512e9af0b4c7142617c8 SHA-1: 74af82250ede63e3bf9728c1444447cf2aeff54d SHA-256: 67b0ade18f4437a7d8cf6ace06917c8f01097c88f2a4b5a58baed9f43cbccc74

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=how+can+i+make+my+phone+4g', are likely used to distribute phishing content or further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.6508

Heuristics 5

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 https://synerhu.ru/uplcv?utm_term=how+can+i+make+my+phone+4g PDF link annotation
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c424731cb---1108881165.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8d4264cf14f9a344b009c22d1c7ff9c/jodoxemekujibovimudur.pdfIn PDF document text
- https://homestayhoian.vn/uploads/image/files/xagiwot.pdfIn PDF document text
- http://kisito.com/userfiles/file/36297593819.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396f5342438---14214774628.pdfIn PDF document text
- https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ec60b3031e18e53f92293cfb39d4273/fanojitigivuziju.pdfIn PDF document text
- https://happy-playground.gr/uploads/_uploads/files/78976164557.pdfIn PDF document text
- https://polaria.cz/images/file/2254518337.pdfIn PDF document text
- http://novo-foto.ru/ckfinder/userfiles/files/52978975739.pdfIn PDF document text
- http://fine-trading-knotwork.de/uploads/media/29222853020.pdfIn PDF document text
- http://wamer.org/userfiles/file/jebamamosamemavunalojexa.pdfIn PDF document text
- http://ambulatorioveterinarioilprato.eu/userfiles/files/newuxidupudopa.pdfIn PDF document text
- http://marketypik.pl/zdjecia/fck/file/26830058854.pdfIn PDF document text
- http://marchmontnews.com/imgs/file/26971326743.pdfIn PDF document text
- https://kanat.com/upload/ckfinder/files/votuzewosobijezeridik.pdfIn PDF document text
- http://gzwep.com/img/file/202191462610.pdfIn PDF document text
- https://pinkrali.com/calisma2/files/uploads/28635180925.pdfIn PDF document text
- http://bjjiffy.com/upload/51228178455.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137854715b30---16145642881.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cba5a3fe77a6468da72008392e409837/25326320432.pdfIn PDF document text
- http://monthclean.com/uploads/files/202109060718238988.pdfIn PDF document text
- https://www.uflo.edu.ar/ckfinder/archivos/documentos/xidik.pdfIn PDF document text
- http://catherine-massage.com/ckfinder/userfiles/files/sivexegawajujas.pdfIn PDF document text
- https://kampusogrenciyurdu.com/file/lutifapodomesalodakevere.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/sm6tujabh38djco79ak8nrgjuh/fidifarerunumugujazemus.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_off0000b1da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1DA	14512 bytes
SHA-256: `a69e97b9103885cd88f0e6aba304018a26c0ce74fe0e5ce513893cc9a9ae56c5`
`font_01_sfnt_off0000d5d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5D8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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