PDF malware analysis — malicious · 4548b4d9040fb0d6

MALICIOUS

PDF

82.0 KB Created: 2021-06-25 22:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: ffd673e373f3ab44c5f75f364988c041 SHA-1: eb63dc03babab1eea06078d22850278e9c455e71 SHA-256: 4548b4d9040fb0d6c0c6c7956db2e2b715686fa3f5fc38f405a3f63bd318283f

164 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 document contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting it functions as a link farm to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern, likely intended to trick users into downloading a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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://crysiq.ru/uplcv?utm_term=10+websites+that+are+static+and+dynamic PDF link annotation
- http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160814e9d2bb9f---gupagazagezosize.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a71489ddb4b---gajowovugi.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6571092873---wogawu.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c077920387---12200753604.pdfIn PDF document text
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa56c0bdc---dilumebavukazupoxurazad.pdfIn PDF document text
- http://ifa-astrologie.de/userfiles/file/vowapekuvapife.pdfIn PDF document text
- http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b8d7695cc829446c0e403199e606890e/wegeje.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a692626627---92467394617.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4553e55fc1---larus.pdfIn PDF document text
- https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ce8250ef9ab2fefcd5f847c955a3da52/jopalevapo.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d59f1e2b0---46315264466.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aca466e7d99---jokoriterisasab.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ase2121kob8e2mo1a42flsfofs/boxufamuxu.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085e93a8b13a---31261834881.pdfIn PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/8vgj04mrl8mdedkk4h06v93esv/sefiwojatovibexelije.pdfIn PDF document text
- https://studiorampinelli.com/file/20972698598.pdfIn PDF document text
- https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cf800933649ccfc609c0313dc878b72a/javafajakivekokudefi.pdfIn PDF document text
- https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/ec4dd3475e212163ce4793cf1bf7b314/losalajoporogaragopajuva.pdfIn PDF document text
- https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/6rrkhjj42tdlabsk7koekut5s4/35968187208.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r9i6e0u2ukeqa0rl9p22nv2bpi/77813003946.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/42a7df8b90c92cb3bfa410c0abece6cc/28634314745.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92cab0396---47818082722.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6d7a3003e27561139428e36522f40c37/moxoraduvakov.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd9435462---39403621775.pdfIn PDF document text
- https://associazionedynamica.it/uploads/file/kopefeleduvedajil.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d13c6eae---54861246545.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In 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_off0000dcb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCB4	16456 bytes
SHA-256: `82ad8f3041ca724b3658a0960a1b663652f927f5614a65431a709227dd4d48b4`
`font_01_sfnt_off00010783.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10783	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011f9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F9A	10888 bytes
SHA-256: `322db317338cb9673a071db03b6306e99d72b94f3159d28667d1cec726a48ffa`

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