Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ba369dcf90d016…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 08:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d94f8bc461e0a603b702a938c3cae05a SHA-1: e9e888605f66d8973cbebaca7fd0ad0343330ef5 SHA-256: 42ba369dcf90d0161637dc5a5451a6e9cd477a17dd86fb393ea0dc3a875be706
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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=ethiopian+language+family+pdf PDF link annotation
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/df57ce3addbbbb6528b28ceabb2cbd83/65982043993.pdfIn PDF document text
    • https://bselink.com/userfiles/file/dololawebibopimudusop.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9896d17046---73355441947.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ce7beac6---7665182418.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/91616995655.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/munoziwugojuvari.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1287f019b---37385762904.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/roxifubesezumab.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ir20p1asjmggqthq71s4hru0j6/53680914745.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vtl14itujmd405enkqk2otqi21/23588231298.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/78980034473.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/geborokozorapojifoziso.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160775f3679fe1---giredejuwarenolapovava.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/sipedi.pdfIn PDF document text
    • https://beaszemin.com/files/71236208447.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ea39cd25279e5bb6f868bc692c38162e/17738184998.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/xovemunesotofejixa.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/76548458053.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/59405623342.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/46348599123.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2c9cd26fa---ganiwosavi.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/1293440194.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/79463430332.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/2787954322.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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 10876 bytes
SHA-256: 8c60a8677452cc3a882c8f00c249b83a2ab88bd68379f984270d5ba4da09e96d
font_01_sfnt_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 17892 bytes
SHA-256: e83d66400f8e3b39e555fd234270bd0b37ad491ba934f1a7e53ffd31ea7ac7f5
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1