PDF malware analysis — malicious · 8024d6147661cd52

MALICIOUS

PDF

90.0 KB Created: 2021-06-28 03:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 42171c04941ac3b0a28b3211079663ad SHA-1: e7e01407b7aa54031ba0403b1385be32ddda440f SHA-256: 8024d6147661cd526d549f97fed6ef227e5651363e7875c572f5a0f43bde7bfe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

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
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://irlanc.ru/uplcv?utm_term=how+to+find+the+period+of+tan+function PDF link annotation
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/125a3dc46c8ca994e6d15d3555bc3ae7/77898669594.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b59d30c6f84b5e19d354d9ee46e1b18c/84635142479.pdfIn PDF document text
- http://espacioschillout.es/images/admin/file/7508269461.pdfIn PDF document text
- http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefb3e74ed---tazefokilepinujurojizit.pdfIn PDF document text
- http://hutbephottaihaiphong24h.com/upload/files/90275826045.pdfIn PDF document text
- http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/marofibok.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980e56b1088---32727914070.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ffjidrleej7p1cinhfpd89uct5/12453748585.pdfIn PDF document text
- https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/skq4qb67sl6fr9iijouqsmf9c8/74323873937.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/91215566cbbce846e0ca48f7dd550b5c/57729667757.pdfIn PDF document text
- https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8f70a4c96286ca1a1b5684c68ab30125/3042327639.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609edab324156---nizokesiduxadotonanetu.pdfIn PDF document text
- http://kondicionery-ivanteevka.ru/upload_picture/file/452515916.pdfIn PDF document text
- http://phunggia.biz/userfiles/file/sifej.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a02fd4cef---51263921596.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a996cfa90---vojelubiribofulodup.pdfIn PDF document text
- http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/viwewuzajareziwom.pdfIn PDF document text
- https://martensmgt.com/business_school/uploads/file/78744595069.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2bcbab97d7226b0cf8f7b80ffcc27b19/pavoterukamozeje.pdfIn PDF document text
- https://circolodelpistone.ch/userfiles/file/tutavenivuzosopisepudek.pdfIn PDF document text
- http://ahchala.com/img/file/wabinofamojovo.pdfIn PDF document text
- http://cuatro-pr.org/sites/default/files/file/folezeg.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c031a2d828db549a270538e5e3733866/rebotowuruzibidavimed.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/auiacpad5674cs231nang0luva/73404948632.pdfIn PDF document text
- https://clubslotalmatriche.com/calcas/file/wokobexo.pdfIn PDF document text
- https://healthmatters.me/userfiles/file/jibugureropira.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_off0000fd84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD84	17044 bytes
SHA-256: `ccf3f3cf1f1dee5a43e6c6101de6ebcf4ac214ea4adb9a10f31c14f32a4f2201`
`font_01_sfnt_off00012a2d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A2D	10680 bytes
SHA-256: `a5211be591f60bd0a7dbfdd3a51975a1f68d97aabc354e29966d4296287c137c`
`font_02_sfnt_off00014291.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14291	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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