Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca863fc9b7149862…

MALICIOUS

PDF

74.1 KB Created: 2021-09-09 11:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a9b060f30b9d180f2447c8877784409d SHA-1: 1ff4f70bbb244ac03c615bddb994ebf24b23b8c5 SHA-256: ca863fc9b71498625e09c53a727dbb309f6b4d807bd24437af9061755aea66dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://florerialafloresta.com/ckfinder/userfiles/files/64783704310.pdf In PDF document text
    • https://dgssu.com/upfolder/e/files/20210906180502.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/xikixurazanine.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/ketokugumanufo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8pu77s4m1so2g3jagse4gm94jo/62002060201.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/derijaxoto.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/56753536013.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/88059004016.pdfIn PDF document text
    • https://penzion-palice.cz/content/44400936861.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/zagulubumujoxet.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161300c5e82c7c---rosuzelalefofonete.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390e32b9e29---89068923207.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/xirutedalitijexapepe.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/75877623552.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/piwunu.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/poxivinej.pdfIn PDF document text
    • http://e-sheremet.com/img/45292405364.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/ruvabanixer.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/78537405985.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109050851535502.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/viximupupopetizuluv.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/53703101621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=on+which+app+i+can+watch+harry+potterPDF 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_off0000be73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 10480 bytes
SHA-256: 57249f8d04eee97c2c4e64decabe9ead58def1b915007d528e20e9f2df3f6a29
font_02_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 17172 bytes
SHA-256: d27dd5e76e36996e32591702f7e765ec72f9f614cf80473cd75890e3e423983d