Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e80083b1feb0f1…

MALICIOUS

PDF

102.5 KB Created: 2021-09-06 22:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4fba4c52dc4b76f1331f68b802969c5 SHA-1: 23c5f33adaaac9bfa27187be17420094527471d6 SHA-256: 73e80083b1feb0f121bd44db7af223173382c88384ab9ffdf2b4b8903fffaa2e
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external URIs. Several heuristics indicate the PDF is part of a link farm, with many links pointing to compromised WordPress sites and raw IP addresses, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df7cc113276---pifujelaxajezuwati.pdf In PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/vojut.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1001beed8---womivuseduju.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/5b1ddc85f3fd8ce0e40ef973421496c5/70887959781.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/62269802193.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16091e0f5dbdd5---58804377894.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/ganegojomufa.pdfIn PDF document text
    • http://amdind.com/userfiles/file/70571898873.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16080eaa08c6d0---tuvipokupivavuvulep.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210630010001_hbrn8b.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/96507536039.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210621154650_plecf3.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fd3e67369aa---nifajanak.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/69068150061.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gelavemune.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d679e48b8805701130a17584ca2868d/xilivenuruxew.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/93989079438.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/99824843906.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/dc446877a78db0c872f1351c6845e683/buwupimozugarakumixojifos.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/46015774107.pdfIn PDF document text
    • http://kelvista.lt/images/files/giparowufezikewet.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58279f00b---pekerofodesajari.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210622_DB4F2E44C50EEF2B.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16087eb937900a---bokozapinunakirev.pdfPDF link annotation
    • https://skatrip.com/basefile/skatripcom/files/74964627515.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b99f5028ad4---deviginiwusonok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mindsets+in+the+classroom+chapter+2+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c02fdca3b---95917941593.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_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14392 10996 bytes
SHA-256: 6a88752558c7ab50aa0db0d98811f0bb0d6e065ef3c488a5d296ac86c8f6bd71
font_02_sfnt_off00015cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEC 18328 bytes
SHA-256: 312cfcbba1f4e842eedc3cf52e025c1c62b4014a72351750baa0eaf5c6806ed2

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