Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d1d6e4b17f2465…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 08:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f75f89ee48595318503cb45205fa909 SHA-1: 1bcae5537a1044e0460dac0a3249f73bb2837ef4 SHA-256: e3d1d6e4b17f24652f144988dd5b38d7147e83aef82870d8d09ada9a05454193
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elsadaulte.com/ckfinder/userfiles/files/55723037512.pdf In PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufowijokasof.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/59569410947.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f12934d1---tujedoxovoxuraxefi.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/ligababawebirij.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/22362308062.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/14024923996.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8a773cbb2949f6100ad404dce0fa709b/40142614378.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xigotodonugowideb.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/baxejubukadexesokeru.pdfIn PDF document text
    • http://belovosushi.ru/files/sabasuletej.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210902015433_phftmd.pdfIn PDF document text
    • https://emenu.hu/editor_up/saraturu.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/dasokirotevewumetekekeman.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/talokogatonuvegigojif.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/vuvebatotojanuxaj.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/66039296486.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/96940859393.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/24733198973.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/54500538582.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109120325481827.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jigapewawegifowexirudut.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405a2460f91---30680246402.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/16973522310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=top+rated+io+gamesPDF 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_off0000bb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB55 10548 bytes
SHA-256: d4fa6ce8652491ac35e8beb3630105d8559110bee3cd93b76a5222c6954095ff
font_01_sfnt_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 16484 bytes
SHA-256: 9fe1e67d9da35aeda34ecebd4e89948799b08997d6b4170ead515b0e0edb7d11
font_02_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1