Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3f8db9199cca1c…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 20:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1a58f8fb202aaf36b1d5a0e52ae94ed SHA-1: ed11fa9771214cd5e4fea17ad7bfde3546982849 SHA-256: eb3f8db9199cca1cf37b914b93c22608cb73ec2f7ec86a1a6a7b9a0d391ca64d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing or malware distribution campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=wednesday+before+good+friday PDF link annotation
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/14060e4fec89a35a583325e14182406e/kazuzikerun.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077c77b0d3f3---najikenaza.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99cf574a1d---kolas.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/felijamosum.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/44423100799.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/jesifirivolexajuneve.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966fa4a7a04---12850155670.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/wogepa.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1c751cbce6a7ae2de9f0e8031f2d5478/70350350278.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/24552800952.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f337ed43---90534220442.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/47151439002.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f49f0aeeb---welazinavubumixugo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5dnanrgj6tta6ek394n5q8id7/82208982848.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/53147705166.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/43523818904.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/54fccead17d64dac46ae6b6462d948a2/sazozibejurutubalebu.pdfIn PDF document text
    • http://billsky.ee/files/file/9759864326.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4134b8479---javemarufexogo.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/if6jlf45klqjkrliskd49t363n/bixewujuw.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2k57ue4g4ltcq17ju0lndttb16/70271680570.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098629c8685f---kilajagodu.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/18803314252.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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 10632 bytes
SHA-256: 4d3eca7e620fa695ae6542a7220c2bc5c2d72c39a74ec45f986b84b93cd884f4
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 17172 bytes
SHA-256: 139c722cbe58db86ab94d11bb79d3eefd9394956f5050b01ea0ecf05b68b0c62
font_02_sfnt_off00013128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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