Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0e55d003c8f854…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 05:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2dda3acbf19b7e59a7ab42969908fd65 SHA-1: c03e192e05ab18a959c928fd6a4f557554070df7 SHA-256: 4f0e55d003c8f854301255d598ad0dc114b2ddb6cfe91cd97baa380ab991b17f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ketchas.ru/uplcv?utm_term=ariens+snowblower+deluxe+28+owners+manual PDF link annotation
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0765c7dc---newuw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa9bcb0a59---wuzamafexozu.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/lixemopowoponurezodom.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/81180820827.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/66989759207.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/larojatadupinido.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/dozikiduzexadewatiraf.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0eba479c---fegafifosuzunaloxita.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbfb3576c---45454835128.pdfIn PDF document text
    • http://yuha.be/_files/file/36731856882.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/puketuzoranabuvedi.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/kizivaz.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf7840643---jezujovabivunuwovup.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/poxuvosegikunagese.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-08-55-57-37.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc144b5d4---14666057293.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4bd90678---jowumudapisage.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0d60023d---46977350758.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba94c453d---7518203665.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/19088246056.pdfIn PDF document text
    • http://kasargod.net/uploads/file/46165828708.pdfIn PDF document text
    • http://vina2002.com/uploads/files/notaxon.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_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 17684 bytes
SHA-256: 69f0a49951e52307f5a86e1b7c2382f2dff73c9524e5bfff4881fd03aa54bb4e
font_02_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 11048 bytes
SHA-256: 28a4aacb49fd6d71dc1b795810e975c83f6b5f68794a7ccf1c5ad0b8d0d45511

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