PDF malware analysis — malicious · 2830681d26ed0146

MALICIOUS

PDF

83.1 KB Created: 2021-08-05 16:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01

MD5: ffd8848a68111db46302364434c9d9b3 SHA-1: 59f409b442436ff4481256ca09f07fa6fda5b9cb SHA-256: 2830681d26ed0146920ff9c1d62c6f3a35e90c429dde2471eac8a7b11a067615

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 0.9832

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 https://infrive.ru/uplcv?utm_term=guia+consejo+tecnico+escolar+cuarta+sesion+2019+preescolar PDF link annotation
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pl6oji6k49cafgucbrsj00ll23/nujufiriwobexuzukenuloxu.pdfIn PDF document text
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c819f9a660abd3314f5f43749d44d665/muwadaratotami.pdfIn PDF document text
- http://www.gyndoktors.de/ckfinder/userfiles/files/renivotaporoxiroribo.pdfIn PDF document text
- http://adamslakeband.org/userfiles/file/tiwebobesaf.pdfIn PDF document text
- https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/9j75gt1gpsbr4tcb5no73u4515/wokuwemiponolafunetadamer.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/745d0776de4379d8098305e683a63d9b/90583300890.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6fe2914fb---pekabejezafinulexer.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/953e8488f34188337f89d0b30daf7dac/41201036733.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a689c615e86---35422608718.pdfIn PDF document text
- http://live-lessons.net/lcj/web/uploads/assets/file/59146422354.pdfIn PDF document text
- http://sushi-belovo.ru/files/nijitawat.pdfIn PDF document text
- http://kimbuunguyen.com/uploads/userfiles/file/vivoranuloze.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f6301a4e---72876672312.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b195ecdec50---babewujoxu.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/1927643535609f4716538ed.pdfIn PDF document text
- https://suprizpin.com/calisma2/files/uploads/14084711400.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/eb9d91c5e1c6278a89a92447f25a8f1e/54491218471.pdfIn PDF document text
- https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4285c01d757abb9e9f63baa7e221c51a/18286130200.pdfIn PDF document text
- https://angkaganjil.com/contents//files/4597020258.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bb1e940351a08ca73e5580bcd0fd11f6/wepomudo.pdfIn PDF document text
- https://chetanaus.org/bheru/uploadfiles/file/nopixezedamolanuka.pdfIn PDF document text
- http://asianaccounting.com/admin/fckeditor/userfiles/file/batiwukukepowad.pdfIn PDF document text
- 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_off0000ed87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED87	18240 bytes
SHA-256: `857b5167ab609dbb1e3e5739e253e665821fbcb8952eac0c6f568ef9d2e3a8a7`
`font_01_sfnt_off00011b7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B7A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013391.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13391	11100 bytes
SHA-256: `81bff6d94ea3de994da9e989d36dcca833df2d3a6a2d28df76cdcc0fc63bf369`

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