Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb24f6966d68a92…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 01:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27b9e35760dccf763afad3fa6bea2ca1 SHA-1: ad03d49c9aa479195a571072fe7a8d0045f75dbf SHA-256: 1eb24f6966d68a92cb0dddd842be9ea5ed3f4c2f6209b8fa445e01f6051dfc85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The document body is unreadable, but the heuristics and URLs suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8dkn6096a880oj94dg6jhesf1f/wedizalixavewuserisubota.pdf In PDF document text
    • http://goddesshair.net/upload/users/files/19313168472.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/waxuwaseg.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/925ff873cbd04846faf61fdf5d42ed94/53168441524.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/17883ea481d949f49e2caa1cfc936d2d/9142047271.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/magazotaletozezofomigorof.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/xifowomubujo.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/belolodaterilikar.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/dazirefefin.pdfIn PDF document text
    • http://rrarental.org/upload/file/61432925147.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/velivol.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/25729786994.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/garuxaxilojage.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8516370bb---totafes.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/gilenipanugowokajijida.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewabovifisatedamanewara.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/muvopusaturevofose.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161363bd569ada---xizesutorijuju.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/8110453114.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612edbf2590c2---rofuraninajusidajiluxe.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/besuwexe.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/68337870220.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/55964265177.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109072210513959.pdfIn PDF document text
    • http://gibisch.com/files/files/noworipabuk.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/60393390462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=live+id+sign+inPDF 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_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 18388 bytes
SHA-256: b9955c0aac3b8b2a2016b48c429a974f8138275e596ba5c0014dd2c58e300e64
font_02_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 9920 bytes
SHA-256: bd6fa26b345c46e9a5efeec6d3cee020e8794e0b2f17b5a52258913c4c124933

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