Malicious PDF — malware analysis report

Static analysis result for SHA-256 1336295a4c5d480b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 00:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 284227044694872c52bd0292ec6c193b SHA-1: 4631db30a847b2b3a8cafcf55af5ff16ea31804e SHA-256: 1336295a4c5d480b424bdc40da14740730034b421cbaea34cad1b08dad3b6c61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, including those using WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=tom+bubble+shooter+mod+apk PDF link annotation
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/sigiwejozok.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/miwemedifigulunukixome.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d78f2db84---35738331535.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/suvitifegin.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/gawudow.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/vifoporufunumivemikepu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d2fe551c---tulamamipuw.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/luropuro.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ae29449a41be1ed287bf10c3e8d47c46/82568369564.pdfIn PDF document text
    • http://olympusflights.com/files/files/73476270133.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/5422290957.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/kemozuli.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/gojelulofirozujagas.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/ruvet.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0997e511b69d151972bf47f8cddce33f/6849319681.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/62c3ba051da1f9275f0c615aac48a6a2/xilubisoz.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/buzoxeb.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k2tvfvtbgaev0jrd5snjgc78v6/xaketovupoxe.pdfIn PDF document text
    • http://vswet.ru/f/gixutekisukefajox.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/26845588408.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/13493983905.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juvekejozulep.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_off0000b880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 19516 bytes
SHA-256: aa5c738536e3a60bcca74a6721961772bc60bf99bb3e5bb9b9bb187517f4e458
font_02_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 10756 bytes
SHA-256: aa4eb474779229982290ccee067062fc71581b63c8059ae4fab6375abec93008

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