Malicious PDF — malware analysis report

Static analysis result for SHA-256 f449f2a0f84d705b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-12 01:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f96c5f73dd14a70a57c3cfa31f7270d SHA-1: d7cdf1a6c2dfe9da5ee22c893f6f14f3e87129c8 SHA-256: f449f2a0f84d705b866e1794f478df60fad6eba2303fef98794dcb1ffed25170
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://huntic.ru/uplcv?utm_term=how+to+unlock+phone+on+itunes PDF link annotation
    • http://futsalcb.cz/picture/vtextu/file/bigupukug.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139866829038---63994309713.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d16eb716590d7dc632909c88d8b09aba/71296483607.pdfIn PDF document text
    • http://kaies.net/upfiles/21090619034334606047v7tr.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/madino.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/mifadifamo.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/72074430867.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/74293626264.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b98cc929---68815568342.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/siwuwivaxin.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/67646299698.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/100024531532.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zuvav.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/56548505310.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/wakaliruxikivolijoso.pdfIn PDF document text
    • http://newo.ru/files/files/nelanub.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/xiwerabawufudodeb.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/zakixivitedinepor.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/fopovulowapimiku.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef3025159---golujulukuw.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/94302200706.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/94355226119.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380088f0018---91415177921.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/25882363215.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/guwulusuwimadafeg.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/5460279949.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/gerebibuxilanixirevafal.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_off0000c575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC575 17932 bytes
SHA-256: 755c649091164efe8aca9cc68d0508eacdd0a4139e599c08ebbbab07988248f4
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 10480 bytes
SHA-256: b935be6f877b4786b8d5d617ccdd417981c0b9ee300568a24df5af755fb3261f
font_02_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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