Malicious PDF — malware analysis report

Static analysis result for SHA-256 610e5f4184194466…

MALICIOUS

PDF

76.8 KB Created: 2021-08-25 17:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 45686a31e81efbcac462cddc2cc13d45 SHA-1: 7eed5d99927e040b231442c4de4063d6906d90a1 SHA-256: 610e5f41841944669164d400925725dd43155fa8b014ff68061f5c262b994f8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or redirecting to malicious content. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=the+hatred+in+his+eyes PDF link annotation
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d00a6a48a5735e098f7096aba9ed9978/17627376463.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/21842840630.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202181532443.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1245c1754---10167598810.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161148efde82ce---20241729539.pdfIn PDF document text
    • http://tmfconnected.com/clients/6/67/67cd703e63b47da0cba1438f70967d25/File/90564443278.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/bubinuwerimapevilame.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dac561761---lunapobirobagidogolilawig.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c1dd960bdf7628ddb159a5c60293df1a/wesipowufazupov.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/71681118684.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/51764188659.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/10113277798.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/93806224218.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kanebalekediwilalito.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7457e518aa597708a3b9ccf77a5720d8/mowatow.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/32027389673.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff7a12d68---98128265956.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/xikitekorelanubup.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a96af12fc64d13a3c74726e595170588/duruwomiw.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d1770d969---89560354186.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/bedanodezerinetiworivezo.pdfIn PDF document text
    • http://dongphat.net/upload/files/vojesivuremasu.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/kugakegi.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/95686994006.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/his270s9pretjgstl2vl497eiv/1694153105.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_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 15060 bytes
SHA-256: 6d8b55aedc92767c39d6d713b7d4f234cb7623ef8e9980080941e144b75b2c55
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 10256 bytes
SHA-256: 29c810dea586e65c516a12332e35e15b7254be1ef9c6b83185ae378d97092bda
font_02_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1