Malicious PDF — malware analysis report

Static analysis result for SHA-256 51930c324031a868…

MALICIOUS

PDF

77.7 KB Created: 2021-08-10 14:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 429e607eddc5a055027df8a208e387c0 SHA-1: b4324b64a6690713cc0efe7ba120ecd07e5672fe SHA-256: 51930c324031a86889744e0aec09b242d07a2647bdf3d1ec29ce342463c3ddab
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads, indicating a distribution or phishing attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1183e1dfde864700984b0946c07055fe/51996732023.pdf In PDF document text
    • http://sy-smile.com/upload/files/sarogofokajotexepe.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e87d9d4b6---lewiwonifinolilinumezuz.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/noi9avrje04o66acae9bgekk2u/xasaladajopixexug.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/3cc9r02gbl59k9atb9hk95co1j/lemumugufozufidizelisobe.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/dumafirewimotikusin.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f547a7675---82677742616.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/28426347466.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/15893561224.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062112243697.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/45967807069.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/vilexet.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/relarisowexan.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/41963790454.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d700fe38b3---vejupupegitarusozisotinob.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb0e01152---8112409919.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ff18217b---palarowegovowukopidafixo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/88kl5kqcqs2q0d1l4fmaoq3pt4/kigop.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/bf4925b21adbaef5f1578488d31d08f3/tirazuwipotolop.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/99f8d3c5847fe5b93d96343067b35d87/56591218401.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/33624749063.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/dekorifoxuvof.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23b4a1407---fanelevizobapokotulewa.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/rukugatavanekowutiso.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/71199699833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=seekers+notes+hidden+mystery+cheat+codesPDF 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_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 18028 bytes
SHA-256: 2809a050694071514a7bc04b056ef1d71ee66ea3d473654be130f8f7699f4511
font_01_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 10868 bytes
SHA-256: 6b71071b7e1ba11a5262508ffc3408410cb69608ac1479e0e2880b1ec0dc8ecc
font_02_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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