Malicious PDF — malware analysis report

Static analysis result for SHA-256 367db76d0aebfd0f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 23:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b02d8101406464198eb773be86e86d78 SHA-1: 07b306f053949c129538deb311c1f405cf8d7400 SHA-256: 367db76d0aebfd0f85b961802e7e3a63ad780a699ec5d30da1c2b87fd519c354
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The links are presented in a manner that suggests they lead to desirable content like game downloads, indicating a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=gta+5+download+in+phone PDF link annotation
    • http://pk.mo/userfiles/file/furepugepukogepebew.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/vokegopimokomutebesugere.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140370a9a3d2---zodurezikeka.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5efca645c355c202da072c8fd4dfa620/gosusefenud.pdfIn PDF document text
    • http://hidramaco.com/files/files/37673837912.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/turofurazubokoxote.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/luduruniguwigogiben.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/61802725237.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/mokefugifevugar.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/47121387427.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/46869678346.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/tukosunatu.pdfIn PDF document text
    • https://digireg.ru/upload/6036486172.pdfIn PDF document text
    • https://sealskinz.ru/files/file/76399273813.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613926dd4af90---kidizokiganubodakikig.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4c373edf---67146750132.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/gimimozagoturugeriz.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/woxamezevuxavag.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161426dec35412---xumiweralebow.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/53022276736.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/16413287863.pdfIn PDF document text
    • http://bronia.org/userfiles/file/pezinitolibegodur.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/52882485397.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210915_432EF90CA67BE534.pdfIn PDF document text
    • https://airbays.com/userfiles/file/finenuru.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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 19908 bytes
SHA-256: 90bfa3519a90f0c52de58e60317228c3276ea19708f30ea28bfe234dfad15f99
font_02_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 10480 bytes
SHA-256: 9baa575c96dcd4c5b9f8768e7bf25174381b1650121ec414e3663af162daf34a

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