Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f397bdaf5e97743…

MALICIOUS

PDF

98.7 KB Created: 2021-08-07 18:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2766641b973b68d2e84fdbc502e24eb SHA-1: 181e3d5370fb60f93ca6f59a450f7e540bd13d3a SHA-256: 3f397bdaf5e97743858f1b3ab26501c57710f697b96a1e75669c983621eace86
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics and compromised CMS upload links further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://www.findvoters.com/userfiles/file/vagaritimamumasesagibenid.pdf In PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bafaka.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072efc510262---vadodabar.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/dipedubinulazafogigijiw.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/19228083184.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a698da65cc405be3e35c0a7b54cb8c81/javapuzumarafusepe.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4oti61u82p1u0rqgrdbjnrraj6/kidagujafusasegijoj.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/76018509247.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/ligaravizutakemiwode.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9vfmvps2frd05gu0loi1v4tihr/dexajunenuvuxurafa.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ad661b795---paxolifiruzipajawuwisor.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/64683025184.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/de624a9c92cf6d1a3e1768171ea52ca5/jimeluselobek.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72b27ad23d---92854154775.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/glqhqmptec3f4sc7ojpp60neld/jaruxeralafuxofujas.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/21077128760.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/59dedf62059d2e3f6145d59f3dccb79f/79474595241.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ca9d646f3730253ee06438edeeea3b8f/61057261370.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f018defa7---33913339491.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/genezupobilafupobope.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5047ae04a---moriwonumotofasefodusotu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad00359d430---suwobexukirew.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56b539bcc---xisuronunizogej.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabb97de09---45407257889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cuadro+comparativo+sobre+las+ciencias+formales+y+facticasPDF 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
font_00_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 11232 bytes
SHA-256: 645668c6ea4c2f6fa90a439df23a75a38733cc55bfe9664164e0b40b084abf63
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 17564 bytes
SHA-256: 7ff669cb0eaeb788670609784ff3c225688125661bb6e29a7a5f4e1585441c60
font_02_sfnt_off00012dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC7 20356 bytes
SHA-256: 719d02907a82623723b2ef637b8b93c103ff4fdea5549d0959f05eb34449b560
font_03_sfnt_off000160e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1