Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf065b06d77a790…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 03:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b4dfefee8d97a64a9521caa3a99bbfa SHA-1: c9598d09bb526ac16527d65c20687e2fea6f957e SHA-256: 1bf065b06d77a790a872862a0f2e2406e3eb9203f2e7d87acb2bb73863733694
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream, which is a common technique for executing malicious code. The JavaScript likely facilitates redirection to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier further confirm its malicious nature, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=ik+sandhu+hunda+si+full+movie+hd PDF link annotation
    • https://dgaspcsm.ro/ckfinder/userfiles/files/gojogibofadi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb82519c71---lifiseti.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/gigikisoditulibojoxufileb.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/sowogigexopimikuv.pdfIn PDF document text
    • http://zamgph.com/uploads/file/072243042858.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/5559173814.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021981450.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/xewajatoxarafififotow.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/tuxoxugusavumi.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/90428133163.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vukawalirapodakixe.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/kekebibur.pdfIn PDF document text
    • http://proart.by/media/file/vutubupemuditoli.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/54189525928.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/56909852183.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/voniduj.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/18767848174.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/79909933323.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/32090952071.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/44004682670.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/40um9gri2ppvqf29jeq6td6u12/nilemivilimusivura.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a921206701---gikabujekuzaluzanipado.pdfIn PDF document text
    • http://bamor.org/userfiles/file/xatipixematog.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/86167627669.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/pimomamirovuve.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_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 17624 bytes
SHA-256: d374cd7bb64e27c02abca997bc82aa8945100bb622e246cbeed3ae766e0f5711
font_02_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 10628 bytes
SHA-256: 7533880d280f288b185f01f3f9a88c69af0f3c34cf4e2e36db08a237d587989d

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