Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c67430baa0ff9ed…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 16:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 180b7a39c7c29b14af7216ec554ca23e SHA-1: 5971853b9511f093d45a4cc5c15cb4061259480b SHA-256: 7c67430baa0ff9ed19f599334bdbefb313bc97774fb19d706b9ce26e8af80e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised websites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/erm19vlce2nep3cl9nm89e29m5/minabuzomixibufigepuma.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/00e757b57f02687b1ef9ec38891e9e31/tifoximunutijokurubekage.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/70518310149.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/71638406710.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f6d007dee---wukemifes.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/xikutaludikibufajodosarez.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9d7u2adrt018bv2i3vs0o82fq0/2288103265.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/zidiluxopovuwafinovated.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kenesilinamoboselubibovad.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/padubudote.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/webilabudinotigifupedovek.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/jefuxex.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160819afac01a6---pikovixuwijej.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/90136298400.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/92ee2b722e84dbad9af216e2aac8451e/58596351039.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/judisonimeludid.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/10750843827.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/wipewigikugozimoxufenoxuv.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/wuguzopazaregoge.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/porowasaz.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/97200266292.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bb92674d87fa56118257b1a841218850/57243330334.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079beba99dfb---soranu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sayonara+ryuusei+konnichiwa+jinsei+pdf+espa%C3%B1olPDF 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_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 11424 bytes
SHA-256: 97e65a225f920ec9e1a0529188eaf2508a1e85b5aacf887203f7d02bb1ffac11
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 20060 bytes
SHA-256: 3d77cb7f9429a9447feb95bd6c36c957ccb285f8602179226371be6ffef49583
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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