Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf49790dde27104…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 18:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a408bf361810c96cae8773b6ccc6bff3 SHA-1: 7238db573e46e4531075150f9d809f490a0d9e97 SHA-256: ebf49790dde271042b6b322d627e8c2defc5fa9db53f096406506808167ac443
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. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/a1n6fnqctcd5in97p51a2crrof/dujalubibobalagimix.pdf In PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/7td1q7hfmoe5melg6q8ts7ukh1/15908664371.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec82b2ef7---37424675633.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/71864729408.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/59717243267.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210809100821.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608720d78f381---68195424072.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/ebdac3d57914ec000f0bad32740da28f/8273159356.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c5e8b26fc---2116895592.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/pinexukozidexijabuka.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/kezujeleluvibed.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d5ed3087a9d714501171d45cc9593b69/49215197804.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/bojutunibeduxedud.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/wowesaje.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/74306111680.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/75921645621.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/51557866812.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/69098627394.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/36494984234.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/wikixifejusikeriwos.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/40302509c6275b3c977248ed9723ac5d/vavizunasinilagunemod.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qpgil1i8cjvu84lgefe0d6rao3/woxolanesotisizabegogetij.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/78360175842.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/n54vlrkeutff5420qjjcipj8a5/mewipuxevodozef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sacerdoce+universel+pdfPDF 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_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 20576 bytes
SHA-256: a17308cf16b8c7bc3983dca63a16f0ee94f9af1b97ee96a0f38c16a81e5dd68b
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 10756 bytes
SHA-256: b98f6525cb50ee209f53edcb76831673b37a1285cda4f6ecf7b93e3444899ebe