Malicious PDF — malware analysis report

Static analysis result for SHA-256 811e0385b0e1f14a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-03 13:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c93b4c2cb156fd55e424a6710655cf2 SHA-1: 251acf2a51ea3f5904d423d134db76f6ce001398 SHA-256: 811e0385b0e1f14a9ea1e680a72d89c8735cb7a2b704539a5053c279a254cdb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=peacemaking+among+higher+order+primates+pdf PDF link annotation
    • https://aedwea.com/upload/foto/nuputexivixokatopadede.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad3c5b039---gedepepojinevasulub.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/wodinulotiguvozakivo.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/fagurumidoxefozovoge.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/lilenigegoradezepefunef.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/71868003472.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/95199729437.pdfIn PDF document text
    • https://angkagenap.com/contents//files/74356150979.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160de343ce3ba6---54637933890.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7af283fc---30941785357.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/10464832823.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/16406619438.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/pqf4j3h6o4knelvt36i6097gi5/doxojesif.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/mawezarijurobo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23193881e4---2774495855.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/tenid.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629ca44fce---soturomibirawefovab.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/voxelimejiwenofonore.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/a112671a834723056932c58b24f008ca/49928458383.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75af875399---30105922992.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b3698efe---fozibazelojasupiz.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021626137144694.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/bonikegagudapo.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_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 11112 bytes
SHA-256: e6f13c241b45e951fc092e5f7a968715a85d4a401771db3a20cc7430c028ceef
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 18740 bytes
SHA-256: 39e9e5c1e1d08fc11434bd1655371b9ec4cb9a8ac87d4ae9817ce27a04850e7f
font_02_sfnt_off000145ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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