Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37a4d3cd7af69bc…

MALICIOUS

PDF

97.0 KB Created: 2021-09-02 11:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8585579cf2a4dc194acab604a2bc892 SHA-1: 8e13984a19f31dc02e8024a8813cf9c8fdbf60d8 SHA-256: e37a4d3cd7af69bc59299727f329e31d2e5995d6c0bfccce8f299ff2b4d33bee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent.

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 https://krisoc.ru/uplcv?utm_term=a+christmas+carol+a+live+radio+play+pdf PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070e27ed44b8---putujigap.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae89a8e3f73---xusizumexofijum.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f606d69e4c5946a71e9910023dc31083/70158113926.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/bigugizutevu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/pezil.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/46947530378.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/31548758988.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/81160047020.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/39782262740.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/48464794833.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/mubl0jts9hog7115m81nrqndga/mesimozebikiwesomuguwom.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/saxokebamabadaraxow.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/92797796495.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2510806921---35822204440.pdfIn PDF document text
    • http://novafish.it/userfiles/files/5012779597.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/rowokivifarixexopaganajo.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/sigekudezuzajosudavimilug.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/34780523961.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/vizofa.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/37114762808.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac301014536---ladepume.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7d7e320e---vikogidugonuv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 17904 bytes
SHA-256: bd906b99eb2d7940fa6f2a89eb2c6e2439ac205cff2f166b7a74f7d101953f7f
font_01_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 10940 bytes
SHA-256: 3db0c17e0e5b0b188035e986a583b1ec8fd0a879116047d59d5951b9d5b4a7bd
font_03_sfnt_off00015aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAD 17908 bytes
SHA-256: 536ded55ea169230bd8c37eb7349cbee3b3d51be78c56a66af8437bb4b954d8d

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