Malicious PDF — malware analysis report

Static analysis result for SHA-256 2132e40ad4882eda…

MALICIOUS

PDF

91.1 KB Created: 2021-06-02 19:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9dfc55f26288792781cc86d5dc5b7a SHA-1: 1a0b1a088cc87a2409d38e287dce90ef89202cc7 SHA-256: 2132e40ad4882eda87cecc88b1affe14e15eb8b0d59d0419e31ed74baa86e4f5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9598

Heuristics 5

  • 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
  • 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://zegabilisim.com/calisma2/files/uploads/85428612300.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/18ika5mcaelv9f50kvdmu1ms70/1430357962.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/58215454550.pdf
    • http://reutlinger.pl/userfiles/file/wesazupunejitoxi.pdf
    • https://geneticapanama.com/userfiles/file/zukijonepowenevi.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/becf8e37a4696eafe435b599095bd379/11943447002.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/vototuzedimujegalosanija.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc2d7d986---bagilopep.pdf
    • https://mayurherbal.com/userfiles/file/sejinojunomatalavelabi.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5388e84a96---sixemori.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f262ab62b3af50bbd451943bb5d3c1d2/kodibafemozepazinuvibu.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/778fb79028d91961f2304213356f8116/rasukufiboruw.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47f20fab6---notivofozujunetukux.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3720d773f84afcb5e488de77a941ca79/94509826313.pdf
    • http://beijingxinzhi.com/userfiles/file/20210524020056_1214159770.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160998ef62d510---bitinosumubetunalunefum.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210510052522.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+acrylic+pour+painting+shiny
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001344e.bin
ac934e445e28b29fa045386e4446124c2c7e440612ece44f5844a892b823303f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 5568 bytes
font_01_sfnt_off00014726.bin
8b45558c80b4d244dad16cc69625383e6cfe0604dd3be0d0e2350740e25414d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14726 11876 bytes

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