Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9ad065c3fe8358…

MALICIOUS

PDF

97.0 KB Created: 2021-06-28 19:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e0a64c38de5590d375ff9cee83d15aa8 SHA-1: 76b2d6a2d7398685b2f654ac661a118b8959838c SHA-256: 8e9ad065c3fe83581caad2c406411a0bd645bcd6d144d89080fd54899fb4c5a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links point towards an attack pattern involving directing users to malicious content hosted on potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://clinicaveterinariamontecchia.com/userfiles/files/35298398102.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/224f8ccc1d30b69dbf54c535efa99fed/6461929688.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/87174158694.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840bc084f4a---40036188750.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/34269328396.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/redidiled.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9dc60c304dad5cfce77ad025bc77abe5/48456663323.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/dasizujut.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3a2e6984af6f3e5222aa4612080e030e/nuxiboluxarajadubuxitado.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890c43028c3---wigapeferudimaluxone.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/254011e0f94ab4082f811985c3870371/vunubifezewekejol.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5a23aff5e26c85036f006978e98261f1/fuxakekazofivukokokese.pdfIn PDF document text
    • http://headrepublic.pl/images/files/70381762181.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/81a34c14c685dee73a43308fecc6c351/85209828739.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/k7t3cdee7c2nvdiocaufvdejna/17497320975.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/vopijogidisokomiw.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2afdb6fc5---16786935742.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a54e2c9ebf34e5487332ece10139457b/nitub.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210607203011920943lwx9u5.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd026837e7---mebudozarumepofetes.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/831f00cfaf07aaf6ab09af1f75a9f172/8838382536.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a358f69f74e---68556380422.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/nazazowusojilutujab.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/kulawafevezizeruwodumixu.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/39515240965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+motto+for+businessPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 17552 bytes
SHA-256: 17af12aec76fc74324e190097f0aa6006cdab1cbe4a1c52f619c06d4afdbd763
font_01_sfnt_off000145a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 10460 bytes
SHA-256: 4264462d71f706d1111836e9b020afc639856ee3f3fb1e6cbc361921df9b027c
font_02_sfnt_off00015d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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