Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c69b16c5799574…

MALICIOUS

PDF

81.2 KB Created: 2021-10-14 08:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39608f5dd3619e42999f9da0a46491c2 SHA-1: f469df0035ba3c7954334f79e4185dd297d95e9c SHA-256: 46c69b16c579957428f95fa91f6dc5b22078830a6b2c7b41179cc339601cab05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gagiongvitgiong.com/ckfinder/userfiles/files/puvawulexes.pdf In PDF document text
    • http://mnarch.it/userfiles/files/15927699387.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/61229904316.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210905164829.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/22496492601.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/47467439123.pdfIn PDF document text
    • https://felicityokolo.com/file/noxolefovo.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/zabamiriforubafudoz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138577ae5af7---zibogugore.pdfIn PDF document text
    • http://signauction.net/userfiles/file/54122495510.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/83754964819.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/44011150063.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/473fee6c9ccc9cc482ac86d93044ce6e/18639939813.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16151121d3be3f---lovawexibapemijogewawi.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fabaxigokawipo.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/vunow.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/92402991241.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/9123919560.pdfIn PDF document text
    • https://themalc.org/files/file/18289802129.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160007841eb6---14702753938.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/nejupuri.pdfIn PDF document text
    • https://acerocorte.centralcms.cloud/galeria/files/vosabug.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/fuduzezerorinaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=list+of+autoimmune+diseases+that+affect+the+kidneysPDF 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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 17988 bytes
SHA-256: 9c6d9d4a7bb83f68ad1d49a628cd92f4da6af766d4515be0ba91fa05a52fc6c8
font_01_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 10860 bytes
SHA-256: 06aec6d820afd2d3b5251c2d19fe315a9e5966acb980bfa03a85ffec7f8df144
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1