Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb4c3cdc3f2009d…

MALICIOUS

PDF

93.0 KB Created: 2021-07-19 10:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69abaea92edfa68bccc57a0a6938da07 SHA-1: 8a19b888cb56d40065e1fc0b36c4429ead71a74b SHA-256: 4fb4c3cdc3f2009daae206b9a1feba993b040dd12c15a028020b1ce00324d15a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://malbreil.com/userfiles/file/wanesotadi.pdf In PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ebc2228dc---85023752012.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdd75c3201---wisak.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ug47r8pkg9kkech2fc1gv44maj/jakutaju.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5cenbetc6v3nobtnr90a7ispmt/vokakeveliliregiguxijavi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/rtpff3vnk5dobfntbb4i21c8h2/23663137679.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/52796305387.pdfIn PDF document text
    • https://tessuno.com/upload/files/60cf3222b3bef.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/vosujoxipepezejodoxej.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/58588122888.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3234714fa59643f4261e9bccf7513e11/munafeza.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6ff8203b---38143440870.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4c2bec6e9bf25deae7748b1b75350845/jizibututi.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/48186386225.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160987eb0db4f2---2673621625.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1bb8ee1cf352190f19211948f9939de2/mizitepifejuxawimivala.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d24e48457---29280969453.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/04d879gt31vl0s893o235g4ia9/11285053020.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc29373f5e---59297444918.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xuradizovetebisovawe.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/zagedosevof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=signs+of+sepsis+in+toddlersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 10584 bytes
SHA-256: dbb74b3fcb8f1bfeb20f1c64ffbad332c2522883dfabdcdb4b62b6fdd844b32a
font_02_sfnt_off00013924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13924 17588 bytes
SHA-256: 3e551f7c14af60a5b0eff7e65920effed1a2ff699fda466d5e8dc0376fc8c62f

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