Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3362a93128dee0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 17:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c244562d7c3f9e40c3e8eb125318379d SHA-1: 730cf43e2a6e64f7c0b35c11cb74a7e61c691329 SHA-256: ad3362a93128dee06d3801c057a4efeadd64a15c94391552bbd60bc86dd46282
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://canionglobal.com/FCKeditor/file/kubujuxaxo.pdf In PDF document text
    • http://aldo-ins.com/userfiles/file/25149080112.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/71989853739.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/vezuxebowage.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/61689238714.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210909_04F3E03E73A8113D.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613693d5450a0---89832010686.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613715de18d2d---92845067999.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/nomazubovezazero.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/sezerinadilekugosifu.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/jafojutasakato.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/fajofuwosopesuneximibub.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/jawexamutobifidar.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba418269ef---fawujotukipobowagovuk.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/wuxurukupis.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161373a963e43b---69431205181.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/pomoro.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1f1tblcjcg0s4k1qk1i5i0hv8q/88061251494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chromecast+widget+androidPDF 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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 19052 bytes
SHA-256: 6de67a6a8712c09d1aba4a7ab3d40ed40814a3775d32990c1ee8c9a688e425cf
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10888 bytes
SHA-256: 94b74f124e4474e23023ed85b8407c807b8073bc6e5b5cc7db6471ff86ab0b25
font_02_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1