Malicious PDF — malware analysis report

Static analysis result for SHA-256 c351ed71cfe13b63…

MALICIOUS

PDF

87.0 KB Created: 2021-08-13 13:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2351efafe957ab98c8cd7ffdeaa7d02a SHA-1: 2d387025fdb23a2bf1291d86d052a72348aaee90 SHA-256: c351ed71cfe13b63551cfd58af7b78a1d2d578dc64d8909e9cf83fdd71066568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it functions as a link farm, directing users to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs, including those hosted on compromised CMS uploads and disposable domains, supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ai3pohpo6r2fp23ru1arueku93/guralokiwamusadevawom.pdf In PDF document text
    • http://thietbibepnhahang.net/media/files/17254850952.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210529010630.pdfIn PDF document text
    • https://medtek.vn/storage/file/mexabawelekapenebewedulex.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/70495798545.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/dajuwisogojebe.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2478f07a1---foputorowasifabaxaputoduj.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/bixazezugagal.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/jovemolufaxitowovovos.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/rofelatat.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/dd544966f575fdeabcab681396a7a907/sitejifotelevazajenejala.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/faduv.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b590dcd7a3---bovepelekazawikunu.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/88281000830.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/87189060015.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/81736851610.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/fiwik.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f7ed0d72---9463478635.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/43763593828.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a875367d---ponolonetelutamewi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ae7b5db5f95c708e562ca1a8bc37faf9/69840262493.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f37c87b0---retejojarebaroxixegofab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=miro+clash+hack+mod+apk+downloadPDF 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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 17964 bytes
SHA-256: f2ad37ab9760e68d3461874741f031844edc14c3d012f1ff48565398b5e47987
font_01_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 10720 bytes
SHA-256: 214f062ea08e07c5b1e4bf558a3607dcf17945d85c43d949e5ddadcbb7396626
font_02_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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