PDF malware analysis — malicious · 65ba4a5797fe1fba

MALICIOUS

PDF

58.9 KB Created: 2021-09-03 02:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: d3365279bdea4fc2816b6db705502f50 SHA-1: 64a1dd740d78f9a04c2b03b9a5e6acb6a172dd92 SHA-256: 65ba4a5797fe1fbabd3e695aad11f7fa997df395ba836c86c2ba2f60df3daf78

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external links and the nature of the hosting domains support the classification as a malicious link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.8186

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://judge1960reunion.com/clients/873273/File/89039988868.pdf In PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160971b217ed2d---81271411844.pdfIn PDF document text
- https://buka.ru/sadm_files/50647276096.pdfIn PDF document text
- http://okzawidow.pl/img/upload/files/80590425660.pdfIn PDF document text
- http://foodchemsino.com/d/files/zagalurijifepavuxume.pdfIn PDF document text
- https://bataretak.com/img/files/file/28166870781.pdfIn PDF document text
- http://helloslow.com/data/userfiles/files/74882041708.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095da51c20f2---96830224418.pdfIn PDF document text
- http://wienbildarchiv.com/upload_files/files/28789211428.pdfIn PDF document text
- http://123dvere.sk/files/file/budonizi.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/n9un7ds04t7urmtvihopc4ogo1/jiroxitimopofora.pdfIn PDF document text
- http://gwardiajuvenia.pl/zdjecia/fck/file/xenod.pdfIn PDF document text
- http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/fagobuporakofizexudis.pdfIn PDF document text
- http://talleresjpg.es/img/file/8489338143.pdfIn PDF document text
- http://phannhan.vn/files/usersfiles/files/fuworoletedusoxotiresoxo.pdfIn PDF document text
- http://snnet.kr/board_pds/fckeditor/2021/08/file/nilimafawapivoj.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/u9gl4k37sv95n0n5iff8r6tqb5/67254899815.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/43d4bebaedc5f3215e3125994f40467a/rapugamuvik.pdfIn PDF document text
- http://urgentcarepb.net/userfiles/file/63290191259.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/28e57ea7eeac69d53b4597fa37d8b400/japavowoto.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/bn3kfu10hcn89f16s8elu8r288/dugedurabujebigosi.pdfIn PDF document text
- http://meadescafe.com/userfiles/file/61577287400.pdfIn PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/iuecta5ucso2ht0tft1u2uacv6/69061053908.pdfIn PDF document text
- http://starinviter.com/ckimagefiles/desixiburu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=addition+and+subtraction+word+problems+grade+4+worksheetPDF 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_off0000b0c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0C9	14856 bytes
SHA-256: `eeaba9a14119842b4acc4af63295f8074b515aeb52da61406f6fcd45ee8c89c1`
`font_01_sfnt_off0000d517.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD517	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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