Malicious PDF — malware analysis report

Static analysis result for SHA-256 54851c9a5a86d3ac…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 11:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e0fdca4d7bd3e0e6b8bdc246249f46b4 SHA-1: 0950da5a59b549a9c7da2249880b4776d8cb3153 SHA-256: 54851c9a5a86d3acb003eb86c8c936304dce9aacf240f14d78a59f2b7d24486a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59521e9817---tutelamiparokadixugomazu.pdf In PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/99328650176.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4954f132a---97436218532.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vavos.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16095bff3e414e---60959175147.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/narugurinoturodeda.pdfIn PDF document text
    • https://sambelteri.com/contents//files/dugumokawomexilorilut.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/wemunilifafokuzilifafekum.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/kifobudiwif.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e079a79c---zuzisezamabem.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021821927113151.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/watebazufirizinana.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/vadixomamukafakiwowibixaj.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/dozagadopiwofep.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/16431097259.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f8570b57---futetepoferif.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/badarowikedokod.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee18bd01521---1185534635.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/90330207469.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adecdb3afe3---72463738827.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9519ef44d744bd42ec604b4ced7e9973/64794767740.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097718d6b17b---pirob.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/3507861013.pdfIn PDF document text
    • https://2acontractor.it/images/file/14037919898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+free+pdf+to+word+converter+for+macPDF 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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 18016 bytes
SHA-256: b22028d9b96e688159e3bab9bda896b876fe06c293a13a6db2e1b44b32db7fec
font_01_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 10848 bytes
SHA-256: 6a25f2c5a29b7573345e3d83cd06bec5e3155ee62c01ebdc2b289749e47b0676
font_02_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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