Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad4b9d0a32e5b7f…

MALICIOUS

PDF

93.9 KB Created: 2021-10-07 15:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cd17b65669641277d76ce66929728b38 SHA-1: 108237bda133739f274720b6a4f58bb39986db10 SHA-256: aad4b9d0a32e5b7f07d34431986e62d42fd0104db8350dcda6bf8bc82f8c34cb
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 or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://wuxihemei.com/ckfinder/userfiles/files/20210913_101524.pdf In PDF document text
    • http://acrclubinversores.com/files/galeria/files/57475127641.pdfIn PDF document text
    • http://119pump.net/d/files/levuvoz.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/58300349422.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81b18c538---mamojonovaxivenip.pdfIn PDF document text
    • http://gibisch.info/files/files/teporatubixuvugomomo.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/kadumuxakifip.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba5de4481---vonoxivilexepugusisomawo.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/53800714827.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/8908381009.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xokirovu.pdfIn PDF document text
    • http://houselandia.ru/files/46440306407.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/17615676925.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/56278416247.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/gumijoxupazidasolaxepe.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/80748818062.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/96134296602.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/tijir.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/jedipipobe.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3e32b1ae---nazitasu.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/59592019167.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/junubokekabetika.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/lagugukebizepivelozu.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/77578180473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+much+pink+gin+to+get+drunkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 10856 bytes
SHA-256: 52049f4ac1a41a3e6d747229074deb603a1cd20a91bcda3728d5108dcbe34729
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 16424 bytes
SHA-256: ef8701eb79685041ba51b48b3ed5be6a2743d899f5b89193a8f0275675b44e26
font_02_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 21244 bytes
SHA-256: 7708f0c3ddcbe7f884c5c06172308795ff5ff87483f6c29f0f8b6a2dd46ba1b3
font_03_sfnt_off0001515e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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