Malicious PDF — malware analysis report

Static analysis result for SHA-256 1116ca0fe5496d81…

MALICIOUS

PDF

83.4 KB Created: 2021-07-03 12:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ddd355ffb1282dd4f81086b1eceff73f SHA-1: 9f6f0bd4360cac698b64082c13880ea2afae4c81 SHA-256: 1116ca0fe5496d81099d000fdce2d345d47df731e0abf3565a4753eb1a80daf7
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/94a3e5b12f00b5a7439afa2a40f46380/rixerifoxapuserajunakelo.pdf In PDF document text
    • https://travelstore.tn/userfiles/file/janugesupef.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/32c397e49b1bd4dc4b8f4db48e7bedc3/fotudedarisidujig.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081071fcdefe---jobuxibajewosoxegevap.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e032246277---nupumazorigoxetaju.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/18003645997.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/43977561798.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/wosuzonawu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee6c40c584---55749759017.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce5474487---jamawarukejer.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/tasefidadiwumoduzaxaviwe.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/32745470029.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9093eef42---zodipujaxo.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/84790234078.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f0d44b09---98523137255.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/zivuwile.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/sumozifurokowas.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vfr0ki7rt5b8qlnda36puca22s/90998642640.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84214da33a---5046877500.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/47423913658.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/51317796466.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ecfa824071e8d8d2a7b3705d9149f54b/38529267682.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/67712954681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=definition+of+distribution+of+populationPDF 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_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 10732 bytes
SHA-256: b08ab53105af4bdb4879a8035eeec526e290b17764dcd25218bd4dda64c844ac
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16332 bytes
SHA-256: e1817bb0c39bfd4e848de3eee2e401f3021b1c29f79fff244650db8a3b0b2248

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