Malicious PDF — malware analysis report

Static analysis result for SHA-256 43da89b73e8d8752…

MALICIOUS

PDF

64.0 KB Created: 2021-10-07 13:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fff939acafb9fc4714cac721ab2141b6 SHA-1: a831c2754bc6d8db598b29a1ed79085626fc6457 SHA-256: 43da89b73e8d875205e6d6d26e7e6a0b2bbb4bbefe4b00a6d5541519776a4d49
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further supporting its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

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 http://beverly.kopanramen.com/uploads/files/kujinifogelete.pdf In PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/dapinunol.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/sibeduzak.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/55584781277.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/kexotexaka.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/sojusaxexizujuwatuzaw.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/40523782701.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/nulanigukeligevef.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/zatijabumone.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d916e656d3---bawifurodasawaniz.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161491079c4229---76036174161.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/89728161029.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/21626769385.pdfIn PDF document text
    • http://doanhnhangiaophanvinh.com/images/files/24348894851.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/70776843693.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/zogolofunelupototavuki.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/tifiv.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c86dd66c46---72586279014.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/86977000533.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86841557217.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca30a1259e---lojomuxewefe.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/11125354623.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/jirumizerinubewux.pdfIn PDF document text
    • https://kawanmto.org/contents/files/saposilat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ps3+android+apkPDF 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_off0000b613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB613 10372 bytes
SHA-256: 5164bc49fbc42d93383b54a446f062c31319e4db5990d0caf1e4fdfac051f377
font_01_sfnt_off0000cd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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