Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3245e399bac6eb…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 02:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b39d0187f6a1256b8b4b98b1caffc5e3 SHA-1: 8352be7e988caca881430c700fac2fbd59f62d2a SHA-256: 2e3245e399bac6ebdc6f2186be21e049f8cda571a17d7196f3ccd7f941aeb152
252 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and multiple links to external PDFs hosted on potentially compromised websites. The document also contains explicit instructions to disable security software and install remote support tools, indicating a strong intent to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://nicolalazzarotto.com/userfiles/files/siberiwagani.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/86663626875.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160926b93c05fd---44878455366.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce08a558a8---7472313537.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/5k2q1u41ckvkpi8ra2rqjsfjps/tanim.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/96b6lqaf97jhgpompjetpoue4s/75881181024.pdfIn PDF document text
    • http://kelvista.lt/images/files/82438990560.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e616a41bf---dinedawesomofogibetu.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/novojapigadupijizexexu.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/korosuzatudejolabifokuk.pdfIn PDF document text
    • http://polkovnik.su/upload/file/70198543521.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a529493f7d5---81826505271.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9611a5aaf---62152715984.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/pusajoxelopunuwivu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a394074b89---41256650198.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9bd938571---buvegixuruwewileju.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a13ed66dd1f34603ae8c74d06fc9d313/mefemimenijiwoxabawo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19a4ea0b4---vebulokutajuzojaparime.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082c70c86873---vanonug.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/maditomitixebimokefa.pdfIn PDF document text
    • http://greenbrier101.com/userimages/16479910588.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/1892708442.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/54769f9acd1b2c02c752b8a8bcd14582/golotumadumiziwumerumupa.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/susizusegexewobopuwiluz.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/59685308819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+license+manager+is+not+functioning+autocad+2019PDF 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_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 28244 bytes
SHA-256: a932265ad683333c90f39f9c5c3a4028f2b77c624e2150ea863175483f787509
font_01_sfnt_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 11448 bytes
SHA-256: 73653cc661d91234bd680c5433178fe2a5280e0854d07148769c093415fd5914
font_02_sfnt_off00014106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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