Malicious PDF — malware analysis report

Static analysis result for SHA-256 daac8bf5bc5e8588…

MALICIOUS

PDF

99.8 KB Created: 2021-09-01 07:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1db662da2036a75a79b960d05503811d SHA-1: cafa959c88aab8712f5cee443fee755fa687e47a SHA-256: daac8bf5bc5e8588bffba78d7c92e0cdc9288835e520876aeefa0ffc9606a08f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or delivering a payload via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085edfaa3212---zimatosowotikate.pdf In PDF document text
    • http://airmon.hu/images/files/mugosuturabufidigira.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710d6f0dbc3---bovajunugun.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a308b8d312c7ece72e89ac71373a0e34/jopumugaku.pdfIn PDF document text
    • http://ceroki.com/image/files/dugudasavexabatikodafo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e369ac465---bijuwapamowewavoda.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608335b52f7f6---rifuzanatufiwebakefeje.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nd6i647op39l908ahs64ojmoh6/gaboralugusofunevej.pdfIn PDF document text
    • https://led7.ru/file/tikar.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cvk9qtp4bs3kc9o0bh7bpo97fh/45999635918.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/51540337477.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/70475499382.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6824c831e---42549938353.pdfIn PDF document text
    • http://dejede.com/userfiles/file/73732854598.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/81731321095.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfd0377f4b---91046404947.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e07e6806---40042107208.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/gefesis.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/24679382581.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b09f4cd8a0---paxikogugozozuwepoku.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/dodaloxixuda.pdfIn PDF document text
    • http://darec.sk/files/files/wilifowapitotekuvuw.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/pediderugax.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/wejenebumofenovodemib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+secret+movie+free+download+in+english+with+subtitlesPDF 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_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 19788 bytes
SHA-256: bfb16bc498136040c0ce5c80189699207737030e793602b8b1455e7c8ae3b5d5
font_02_sfnt_off000165c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C7 11280 bytes
SHA-256: 39a93c1c6295d706ecbfb520da2521fc3d44d6e4f3fe741cff2feca0800ac47f