Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b94b421415bbc4a…

MALICIOUS

PDF

97.1 KB Created: 2021-10-12 09:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fcd0b4b8879c24444ce2a4091c33db9f SHA-1: e1a4fe215006b2ae37944c121aa78bc72b016e4c SHA-256: 5b94b421415bbc4a6da6b2499b67c7d2f3be112b0ef56285c08a7a8455b64e0a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

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://morganmethod.com/ci/userfiles/files/sixasibuvoxufoxoxelepe.pdf In PDF document text
    • https://defi128.phpascal.com/userfiles/files/27242145282.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/45202826043.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f254686faa52691fa536efa0b38f3b19/80751335948.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/vetav.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/2478441317.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/fuwopafiwiz.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/58437055434.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/7kdnt4lmp4d37kj3574bdtu8g8/zitelowuk.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/karaguzozarurizubolenajo.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/32846140326.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/92740962725.pdfIn PDF document text
    • https://demo-universal.order-pro.com/ckfinder/userfiles/files/gilekafi.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/xokegof.pdfIn PDF document text
    • http://m2m2design.com/userfiles/koxuvafimemixiwufepubegi.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/79199273479.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/70886401767.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210907125901.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/66986998746.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6beb67f7---bokowijavajefosin.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/6614744884.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/99789781117.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/viwobivifexisip.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/lurazapoxexagukozinelaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=order+to+watch+one+piecePDF 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_off000142c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE0 10508 bytes
SHA-256: 435a45b43509709ad58538ef78267c7830d69109e5e95ef0627ed3354cd1d644