Malicious PDF — malware analysis report

Static analysis result for SHA-256 96858b52ad99c162…

MALICIOUS

PDF

72.5 KB Created: 2021-10-02 18:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7a990bb573f91e526e5b3f8547dad8f9 SHA-1: 9872351f8050acc95addbaa8257570b15e68a5ab SHA-256: 96858b52ad99c1627f56ab5ddb8f0b6af9c8b82f69c8aedc94b485dbf2b33cdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. Several heuristics point to the document being a link farm, with many URLs hosted on compromised CMS uploads or disposable domains, suggesting a phishing or scam campaign. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=download+latest+cartoon+movies+2020 PDF link annotation
    • https://diarch.in/WYSIWYGImage/file/85344320527.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134de63f2f35---57560659188.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131341d4ba72---biruzuwizenexuna.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/58759514663.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/zujune.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/nanadomofi.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/nasimimu.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/ruralepujiwudometefo.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/najuvovixasitonifis.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/ritijimalakuzetimosizutex.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/50638285552.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7f87f1c0ee07fd89e0489aa7e64c096f/kexafixigakojit.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1615814c4d59cc---ridinevat.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/gegisiwojo.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/37975819511.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d16150dd1c---raxeripowuwidikikudin.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/81768450207.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/fesatabizodifowunaber.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202110011100056236.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6d050bc6---wurokemaxodet.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/83601222149.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/62787075383.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/xarilomesexavuzo.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/noxadapuxufavovazigel.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/44543249298.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/wapewiwesomixor.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.

FilenameKindSourceSize
font_00_sfnt_off0000b741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB741 10924 bytes
SHA-256: 4291cb5b515004ffb3d675bf72589327fc5207051cf0d8a3406d61ede8cf6d93
font_01_sfnt_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 16248 bytes
SHA-256: 7038691e651df01b8687bd1539290cfdb785adf2e87399e02e73ee3cd67cc1d2