Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a2740de599ad5d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 14:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cff71789fdb7227ddffa2e0ed709107 SHA-1: 69f8d2d04a3656a75ceb625af22e7567d80e9bde SHA-256: 31a2740de599ad5d543437e60a712e2f056b918df48db20ce00fe98bd43c7b16
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document employs social engineering tactics, specifically a 'ClickFix' lure and a 'Password-protected archive' lure, to deceive the user into executing a malicious payload. The document contains numerous links to potentially compromised websites, suggesting it is part of a link farm designed to host or redirect to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed social engineering techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/285a282c7d2e86b56113d2afc7a379bd/jiledinikobasedif.pdf In PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/6808767145.pdfIn PDF document text
    • http://client.diffuse.info/files/39920915491.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4i3e4uudi8uklm7i85e77knfs3/towepiranusufebubogov.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/81114911738.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1111ffafd29c60e73ad98498ea47ff2d/bosetiwin.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903103048.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mozanijikasesinogo.pdfIn PDF document text
    • http://irinabailey.com/upload/files/7258600926.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9src9um9cfe83c82ld7k22i3fs/bisaxixog.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/gejif.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/dd55f804ec4af753d34b9398244b2064/60643454307.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/sawas.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/buxelezat.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210914_EB45DDF7D6225067.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f82e81647---xexalenibafirap.pdfIn PDF document text
    • http://telecycling.info/files/file/23531708624.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/34793431969.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dawazudebulonefuxi.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wufavotib.pdfIn PDF document text
    • http://talleresjpg.es/img/file/vipemif.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/kojorakizesutetata.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b05a2013---65776126168.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/69161121161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+recover+pattern+passwordPDF 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_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 18980 bytes
SHA-256: b8ce6abddaff1c7c05702ebab272529d016cfbe0acf130c46989de5b9e6da038
font_01_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13141 10512 bytes
SHA-256: 9b07773d1ec1c5e0c203c783431c0635cbd47b7a0e431ffe371c97c41f7b2bdb

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