Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb0e3d17272f1ca…

MALICIOUS

PDF

98.7 KB Created: 2021-07-01 22:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5bf18611e12800d1c0184bdcc21d496a SHA-1: 34232df53a701deaf65926ab0249160d9ab4e02a SHA-256: ebb0e3d17272f1ca1c6b22ae033f5ee5e334aa9c8fcf7f24540aac1f6894b343
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various websites, many of which appear to be compromised WordPress installations. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm strategy is a common precursor to malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://huntic.ru/uplcv?utm_term=fifty+shades+2018 PDF link annotation
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b29d88828e6eab094b8f4ad840c0be41/86931564241.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/gerisodeju.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/92ca146586aed160fd477f13a0fee85c/61780129505.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h9ej26n8jrgtvp4tu1bnlk7357/86442351371.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/3475462744.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ab3b3655e---71146849533.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/5795263489.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/vubevizopim.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070596dde54f---wiwomuridudiwenezisafuda.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/681b3ffc200ef1a5cb34d531d8803dc2/20993544379.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/hk5hlhmt9cc4cusm7n0b6t8h94/rixobejiximegaxu.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2hhkeluhvvvp7rbqvrqu1npqn3/30790873458.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6839268160---55045387737.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7acd591fce8af13d625756e1b1855628/gakofufuginavug.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/89e666c1040b203d0304b408f33a70b6/pidulijozedogon.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/ropagufajetunuv.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/fokolunewavuburiwulajozur.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/im2et2md65iujqvlv3ri2679d3/xeboxefuweduriguketibiwi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3076115a2d---tatavavonuluworo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2464d01e1ba84c45b94a03c0c4c367d8/rukirotimopuzew.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/60924414273.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/npg8pc8sgprntrispulo4kkha0/3381287118.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160970d5936196---bivitasadowukeforej.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 10676 bytes
SHA-256: 95c19427bbeeeaee39c306e54cc0fedef2ba6c5291398847c5a951ab5ab1e012
font_01_sfnt_off000133b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B5 18656 bytes
SHA-256: 652a912e0a2bac15a38836291940d3fcd65ce106dcbcbecfb87a5eeae304cb31
font_02_sfnt_off0001643e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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