Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87aa8cec5305ca0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 05:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ad2c2d49b48351ae46aed3672d70493 SHA-1: 1c720f6d49c1fa1c61f428735fa11d4d1fb217e6 SHA-256: f87aa8cec5305ca0c3c4b1a74daa22b7caf591929957e62928da4c675a6f4817
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vegas-shop.net/uploads/files/16713384136.pdf In PDF document text
    • https://topclassgardening.nl/images/file/62870790435.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d44d6317b8f74680eebbb1e67e2496b1/65594558967.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/40001307741.pdfIn PDF document text
    • https://proia.bg/userfiles/file/85776841028.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/96096202525.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/96495498768.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/b8a3de5021ae1079d2ac636d2dd54496/fejunuge.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5ainlom06utvjaiemcpvrp9gpf/52936854467.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b3e328612---bopemamulaza.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdc1b78067---32190801040.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/12t49gdr99fbeqo1tv7q264n6n/91705679788.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/lovapajibezasi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adbec66c28d---xinabaxinufo.pdfIn PDF document text
    • http://skolky.info/foto/images/file/sotixulabowunojijoj.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bipaxevufogiwadogusinum.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/38f188ac6b5d2acdcff85061e8f5a850/99699728662.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb85a6258---nobuzanobewanatuvewa.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/63013869340.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/895972e35e4dcfa7a63849a0dc11d1a6/gizibaguruxilawefasaxabid.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/36689480832.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/2541179202.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608639142cade---zuxoxilunukon.pdfIn PDF document text
    • http://atek-ent.com/upload/file/3521585546.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d8bd7f2dc---29276184396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kangertech+dripbox+160w+manualPDF link annotation
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 18816 bytes
SHA-256: 1ed8ead17a71461afcd457614a83aeb24a7551ad98041f926d848637d02c5f05
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 11556 bytes
SHA-256: 91d4edfb31c9d7fb3daf893d181061ef1fa05cb46390fc8fef4c5ceb16aa77b4
font_02_sfnt_off000124ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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