Malicious PDF — malware analysis report

Static analysis result for SHA-256 1782e35ece4cbed3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 10:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8fcc2c3b549d752a79bd5ea4ba601e3 SHA-1: c4d60b9debb54f178ebc2c2f1ff8ffa5fc73cfbf SHA-256: 1782e35ece4cbed39408ca0a6cd5363a9db424aaacef1789bbc5ea1e031918f8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external resources, some of which are hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a secondary payload. The presence of a visual download button further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://immo-macedo.lu/userfiles/files/34595773583.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/17188554012.pdf
    • http://tungalag.mn/userfiles/files/43434530371.pdf
    • http://www.uc-kushiro.net/images/library/File/24067440441.pdf
    • https://bokaichenyu.com/upload/files/81478556540.pdf
    • https://hongdung.vn/ckeditor/images/files/56253254129.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/rukimaloxapije.pdf
    • http://nanoservice.cz/upload/file/dojukili.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb1860f6c---35146759078.pdf
    • https://vgi-vn.vn/app/webroot/img/files/vivijefivatidobewaxosobu.pdf
    • http://jorkurojus.com/userfiles/file/10613273936.pdf
    • http://bezpiecznamlodosc.org/files/file/58967146450.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138325688406---devakemodezu.pdf
    • http://hrzservices.com/uploadfiles/file/sumixofap.pdf
    • https://artistaone.co/userfiles/files/66477086334.pdf
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/23972768583.pdf
    • http://stjconsulting.it/userfiles/files/pulivenutupulajapo.pdf
    • https://camping-du-lac-dijon.com/userfiles/fichiers/26512541373.pdf
    • http://diagnosticaedilizia.com/userfiles/files/lipinafosazelewomi.pdf
    • http://bajcsidavidfoto.com/_user/file/8155627592.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1f8f0d3d4a1880eb0aa0be0c3b6ae07e/20630457501.pdf
    • http://julianina.de/upload/file/46340649632.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/91440453628.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=alien+browser+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65f.bin
cc3b148fd7a271176308d4466410cf7234e6e95beaa3d95488771dc52609165b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 10588 bytes
font_01_sfnt_off0000ee7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16792 bytes
font_02_sfnt_off0001068f.bin
c2d4d02de2ae513bf0afbb47882b7971d51e449b094476ae5e292bf616140bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 18212 bytes