Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd55c9d556af96cc…

MALICIOUS

PDF

202.0 KB Created: 2021-09-06 16:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d569bb6b5efa58074a0d0914d230667 SHA-1: e7d3711cbf6dc677bc60c4d8bdae38c2d34143f2 SHA-256: bd55c9d556af96ccfc60314861ef584605720af5eee08e26f07b790216e4480f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the presence of external links and the nature of the heuristics suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=veritatis+gaudium+pdf PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9a05b2f6b---waniludibojijobabowejo.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/57562945554.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/29627489416.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/woparifubanuruveben.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab918112002---63130405384.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/mebujetuganuwojal.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6afb9487---49909027214.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/farodopetojapuzokixobu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ddb132c308f542b53bb419bcf56abfb3/15500347499.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add393c70de---65656255737.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/62876217137.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7af72fbab21c00e70c42a43f85fc640e/3372477476.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072348e41479---tixinonuxakurumusujegamo.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9c13aa8b6a9707f36da403ce70532e30/porelexuguxekoz.pdfIn PDF document text
    • https://soechi.net/userfiles/file/lizofabakokabumu.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/33653353512.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210625130405.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/rewapefolojijogela.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bunuligiraturiki.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/40601215594.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pasafivagegite.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210828_AE94F6758D119163.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/24953706367.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/61046129082.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_off0002ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA57 10640 bytes
SHA-256: 91df4df1790eaf4308e5a50ccf6cdf30439adf70f06d6136e11791e84d042e01
font_01_sfnt_off0002d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D288 18260 bytes
SHA-256: 15f70cca68250e76d6cc4f6eb4675928b23260c99bfaf2630a100fdbb261cff5
font_02_sfnt_off000301ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1