Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0df4b8c508f1463…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 09:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e9d8a1a512dd7d1bb9a41dff82181b6 SHA-1: 8c2ee6bca9d93e5980feeaaa53d752e7ef2636e0 SHA-256: a0df4b8c508f14636031a55438a5acfcbecc6bd31b47ec085eac2f969f3f3342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving the exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=spaceflight+simulator+mod+full+version PDF link annotation
    • http://akicgiyim.com/userfiles/file/ruxolunutovomoz.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/70263054473.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/vabiki.pdfIn PDF document text
    • http://meta-min.com/files/74078863371.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/xudefoxesufiz.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f55715a0---sojurozaxajosibugekufatex.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf6929f77---sexuxasanututuberuv.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/86141050852.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/lunamudel.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/94103846614.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9q2nd1p8mvl6ch2ulumeeogj3i/remarariw.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/30250625284.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/suvefopaxebivasun.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/kuwedebunuwiniwubeta.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/25278156733.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/pezolutugokubuvuj.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/fikaxuwifusakas.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/fofinixeremo.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/13182522640.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67704321457.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/78928427563.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/39136173422.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/53503012674.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/59029880931.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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 17716 bytes
SHA-256: f850c162e985e61b160d195d5031b998f20585ea4281ffc23420fb5e86a71916
font_02_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 11308 bytes
SHA-256: 9f600135861aea1226e21d70c6378e2e29590794b3d391cf6bb5dd60b5f7384a

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