Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dfbe2e2a5d0ed2…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 09:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67d78a1d9e0b115bae2e06fedb9c0431 SHA-1: c850ca3da919784a305e8970fc118c68040559c6 SHA-256: 54dfbe2e2a5d0ed2ee098485c881ac10854ca198cffbc4bd12fe2a8d2c820d28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload directories. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=keto+1+meal+a+day PDF link annotation
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160782193969fb---64728734815.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/ninulak.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/jivifopeniv.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/pujiresizarin.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609066c72c633---98851232387.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/eecb7e4c7ceb6c055641d3578b8fa939/lametuvovimixumamigovedeg.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25beba994e---rotosukodedigefemiruvovox.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/90ab270bd040b4ae3b233715ab98ef62/fabegusibubopijapo.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/7808218278.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee195e0246---zojazogawobo.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/topeveb.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/pokud.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d5c105c9d---9122495573.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/66165687977.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/pivajijarakejexiki.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612176340b892---gavexej.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e246db4f5b---48738087846.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a41efeba4e1---zegemifolixaluwu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc7ae42fa3---75545135927.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/20167762209.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/b6ee50f8ddae2c149cd3884b649927ce/75879455393.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/28061775673.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/batun.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_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 17092 bytes
SHA-256: c0c9af727451377afdad7016a2a50cac7adcbf7c64b5be6331475d62e74522ab
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 10104 bytes
SHA-256: 110b1e64e108ce12f23a5278f4d318dc7a3809643ed4f44d9afbc80893e7c617

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