Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb90230b2302d0f…

MALICIOUS

PDF

81.6 KB Created: 2021-06-29 21:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d300ea5b5693cc1c9901b3a7e734d698 SHA-1: d19c7de7627b6b3d7b4a96cd8cdc66dc694f908d SHA-256: fbb90230b2302d0f876acd462d5802574e7497dbc5c2fa4fc057f5ab6a9ac06a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=cooking+ribs+on+stove+top PDF link annotation
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/86084604186.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/eubf5f4qvbhopc267jiab46g96/zepobetowabixizafalip.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/temutajo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5083ebab86---romiferatiwarok.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/xosilefedukamumulal.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/13cfe50d6c830910b0538d4d940d0298/sinalekanuxadekokufinases.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160846ad1edcc5---wiwuxofu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/33da2113292faf5193b329e3e2e6e91c/27923912183.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kidibesokatiralobuwonam.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/j7hbtqhqfp4ndtvofhpl170pa5/77940295734.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/jedurovidafojolo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab405701f74---96185430689.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zibupidosijebudamexabif.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/de7f6f146f44f0298718a95a6a9a7cab/91573500807.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc77503ff1---siwupubufu.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/tavenirolagawalisa.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zupupukinabugifaj.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607269cc33b9d---jebozotelisumemotaduv.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b7cec6b8---6787540653.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087773457424---93965134243.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6606c93b61---rikubipinul.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/55992076514.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abf60a2f7dc---jevaxagifus.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/80568407607.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 10548 bytes
SHA-256: 19fe0f4daaab47a2099b9ae8e473d84343d331e9f52571562c46360978267612
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16872 bytes
SHA-256: d003d61826a9b08b4a9b278bbb657c49c28084753f209e7d523c13a4513f647f
font_02_sfnt_off0001213e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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