Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff130cdebf7806e7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 16:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a64f7c4c7a7dcb5b15429621f2bc6006 SHA-1: 885fb61daa3f82e757abae0c1a6b3cb72332cbc6 SHA-256: ff130cdebf7806e7ce2e7324765e18ab2cd698272b3d88654e7936bf1b05ba1a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of numerous external URIs and link farm indicators suggests a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://wine-paraphernalia.com/files/winep/_repo/file/92036856978.pdf In PDF document text
    • http://secretinvitation.net/images/files/junibezepobes.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/giralodudujirep.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/tidazumijisazadi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/153818d36b781fa04b31c7100adeb305/87082775439.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/12503862903.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/rowixapi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00ebe09f7---rapawagerilepa.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/de43d7aebb69e03016f510a60d882d64/98557592066.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/21c622b020bb37e9ea70adb95e47c11d/92202654835.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/ranikifevete.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/perixigu.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/3213310111.pdfIn PDF document text
    • http://ubest.ru/images/file/zusabavowizibulir.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99e046707---4093854325.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e3fb9fea---56802324362.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160743a3b220cc---xeneteg.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/tenotinavirabozejenuzegi.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/25245987104.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/96229388615.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/44718980818.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3e1npq61vn3svk3cp9skoatav7/gokazumowekexadupuximamuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=uworld+nclex+questions+pdfPDF 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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 10892 bytes
SHA-256: 57bdbcec74e84d9980fee3c52838dfc8cff22000e099345475e0d510ce894b96
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 18284 bytes
SHA-256: 677fc0e5379faa7abfaa1c22ec04238deaab3a64c10cc4a20b3d98d745a125c3
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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