Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7487bf89373c3da…

MALICIOUS

PDF

90.8 KB Created: 2021-07-25 17:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1dae9ba9f1e58ddebd8e28b4f3bd0dd1 SHA-1: a7305f5fe5eebc23acfcf0c1814f63184717815a SHA-256: f7487bf89373c3da64e8ab918d7623726c266f5ad76ccc25f5ac1affad8828c1
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and a fake download button, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nature-revive.org/files/file/25585316296.pdf In PDF document text
    • http://poorclarescork.ie/images/57363423013.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/xasazudukidupumubufuleb.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/lufutidewuvajur.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/laramozagosofetowawagob.pdfIn PDF document text
    • http://stromzeleny.cz/file/tiximure.pdfIn PDF document text
    • https://keongracun.org/contents//files/74509805117.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/42766140950.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/tapotajulivuxew.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d555c8235f1737255165a7bf1440d669/59469596908.pdfIn PDF document text
    • http://hopsch.de/uploads/file/dofawewodigemibudupe.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/78312127926.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/400659c9faac6d85d2a8404016532a59/59222425207.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c5f90b05---sudizotepufimedomedujavo.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9e194692719ca80353b219d9151c5e6e/78522427540.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/tulusiligidegetulaju.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160df047b702f6---24963207624.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/10288291686.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a9f4850da---xomafofitozevasobeto.pdfIn PDF document text
    • https://icbacademy.com/upload/files/32687211617.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9680f90f9eb4bd18535fe1da6e14f2d8/sunaxidizusi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b424a0e010c---46750215161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+autocad+2019+trial+versionPDF 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_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 11068 bytes
SHA-256: c7a59128baa38ecd739f06a287db55303109c2d06a492e6813506193cf61aa00
font_02_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 18308 bytes
SHA-256: ff21c46d9a4084b0b8f8d1dcd181f59a85a77dbbbb38d2caf9150e76c7e91e70

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