Malicious PDF — malware analysis report

Static analysis result for SHA-256 24be49a440ff8ef9…

MALICIOUS

PDF

88.5 KB Created: 2021-07-17 07:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24fad5ab320f97ee8c5522ace0cb2451 SHA-1: 3888a92937c51883760752a0a7cd9c4b52bd20f0 SHA-256: 24be49a440ff8ef9146961f1088dff5677949a5121f495761365ed701497dd37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c286c6496e---71048822091.pdf, are likely part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ratchadatitan.com/UserFiles/File/kifazufalabefajasoju.pdf In PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085604c05380---mupirujivozusarapefep.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/97fc955146aacd227ccc644827736eb8/salefinifim.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8ecffa7be2573600c6bf092eddafa134/81804869971.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/36930814920.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beafc47ad65---kabazaxemupe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c1e77bea---93400472294.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc53c330f4d---69471837203.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b1e3c52a80eb876e0e34e8eaae76f1d6/gebofuvudupaj.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/14e6f042a46c699917ac368a9217f3bd/nexuk.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/gedajuzelabifezi.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bf12cc810e2440a08500e162bc728bc1/xuluwesumokelo.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/64861365917.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/45815442987.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a376c6dfc1b226c5e9b043b1d28bd4ff/sonadorogol.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ncsv7i75nd44k0l8qbbbrrn9n6/21522261792.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160badb801472d---85428221369.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210706032833101.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/ronepegagavetito.pdfIn PDF document text
    • https://plasy.com/uploads/file/54951905127.pdfIn PDF document text
    • https://signika.pl/Upload/file/72354749024.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/32238181586.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084372730e26---vogiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+fire+old+versionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c286c6496e---71048822091.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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 17180 bytes
SHA-256: 4307bae8b4d6979de40adbc0d11cfa0a765acaf79fdb937af15767638532f1bd
font_02_sfnt_off00013e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3A 10128 bytes
SHA-256: 0b568b34719a2e48f05864fc70671c87197162e6d78e8de9eca2a2783f2d6895