Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b55959b05b378e2…

MALICIOUS

PDF

97.9 KB Created: 2021-07-04 16:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bb29c3463513ba79252f5704e127602 SHA-1: 6776ed9a46f709c8b293a2fd54694d6decbd0062 SHA-256: 9b55959b05b378e223dc2233e6e4ac43d67c1bbb590fa2fb09d36e629dac8fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm heuristics points towards an attempt to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://gphs84.com/clients/866382/File/jipoxiwinefijefanu.pdf In PDF document text
    • http://dzbnf.com/upload/file///79422666527.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/xusebuz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d87d917f5---jovobotajamobedisag.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085217d45ae0---xawumubini.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/jafufovapofafogi.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/8517612305.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/modesiforepamunol.pdfIn PDF document text
    • http://www.bash.cl/media/file/wegelowinesus.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/89811292895.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083b684e27d1---tuzinoladaxul.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/84208968652.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jfi8vu8omsfl7pq6vaujivq4ev/98004974408.pdfIn PDF document text
    • https://securitydm.com/slicice/file/99923594343.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/riwalezatut.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/fokumonesosakuligek.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0037f9107b---xugokexewugojaxuze.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c051e1ae8b---62647325315.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ba2dhcucg5on08a0o9s4baqugh/46770573802.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f28b84a60---namorukutopuweja.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/baligutofivex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bet+meaning+in+arabicPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001037d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1037D 27224 bytes
SHA-256: 11c8660c28178a622efe204403939c2aa3dc963302b2383d5d3d6ba1fe2dfbb5
font_00_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10432 bytes
SHA-256: 4d67cb9fc92c49a25bc17bff4ab4bbe8bb0747b049ae2acf2403f02df1f10044
font_02_sfnt_off0001346e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346E 17536 bytes
SHA-256: 5d915d7bac371bc11bd42cfba5e301f13bc63dbcf59a6ca7f5d12a8bed2a268d
font_03_sfnt_off00016259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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