Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d419865309393a…

MALICIOUS

PDF

77.6 KB Created: 2021-08-02 15:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6025d6f0f15766997e4827c42c79255b SHA-1: 49ab7052c1bfca8ccf19dcb4cde279fe15d0dff0 SHA-256: b4d419865309393a77ef0f8b5b88bc745c659e1a04f61e8f47a6a509564020be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6658

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/t722ebal7tqiosamg014v1uf2f/28398292036.pdf In PDF document text
    • https://pharmnet.cz/ckfiles/files/files/159091851.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075439445a08---54675940562.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1fd343d318b429a04418494de32d6f53/22882105516.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/75712713444.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f3149e73013---mojog.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/fufolakuwerebigoro.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/74186876548.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/zukinuvejivusawug.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4q5tfqp6tk1k2l9b2p1d43i7u3/26310612449.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16075edc97b986---86227346563.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/73286241060.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/tabemerimisavikofugiwo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f14d37ea4ee7178a38e378d30d5b7a22/vulowonaxavejobonejimuzez.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609883877421f---22274304837.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/57000704616.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/bopuzo.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/70120192146.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f137e2aa7---kofujalorili.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bd8e47d97bc1d91bed94948e18438db4/23598958652.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210620_1268E06805439EAE.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6574052d17---petuxozijifejojusuku.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ead35f8a---68346066040.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6da6efe8d7454bd34c5a948adf62296e/vatinun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=psn+card+generator+without+human+verificationPDF 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_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 17052 bytes
SHA-256: a159da501770ae5088d4844efb496ea6f0d0909f85558522cc00928aadb5ea5f
font_01_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1