Malicious PDF — malware analysis report

Static analysis result for SHA-256 e135d8cea79e7fb3…

MALICIOUS

PDF

74.8 KB Created: 2021-08-21 23:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cbafad78ae0f870f3e4d76994e539236 SHA-1: 1838dc10604dfc924566d2ff2c1cc96805e55540 SHA-256: e135d8cea79e7fb3faa3de15f814eb1da9a77149d838abb4d2bf94f77e12d5f2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7511

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.
  • 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
  • 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 http://www.colormotion.cz/UserFiles/file/18364427755.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bec2aefbb969afe323a6bbf378dedc2b/50446599940.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/zusuzupitivoxuwu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/t5gr3vmo95al5hurge6du1vim5/3659569.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95bf614a9d---47802439869.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/xalunapo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4122157db---felinusosovelo.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/d29672665d3cc8155feae95441c9a00d/lapetigorotiluwivel.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/xunafogujapasorupexaji.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/mikipaferetebes.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/mejijapetak.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/nndbaouemfbe1knu4o8q7tscg0/29059067322.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rd8cd59q5jv9cr5tcokh42454q/vovesixidimevod.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103b0b5c60ea---46460358754.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11622d9e51---buxujosevozelil.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8929ec25---sabegiwugepoxekilisima.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2888913a4---nibasewumosegajoriki.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16109ff8866fbb---35577888534.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/bepefasomakufasumujawo.pdfIn PDF document text
    • https://polaria.cz/images/file/31071990397.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/zudiwaxekebosokarikuna.pdfIn PDF document text
    • https://studiorampinelli.com/file/27789600400.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f2a5b0dd3890fd6f1e00fc105efe7f39/samavaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=daftar+harga+kabel+supreme+2019+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 17024 bytes
SHA-256: cfa80dda05d1bb9abeead7e8b811a714ee7c369f38ad35ebbdd1d13f20ecde50