Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55ea4a2177898b3…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 09:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b47c7d689bef876e66f952171d4c1317 SHA-1: c69faa27c5e2fbc1680f30fe5984509d595cdaa2 SHA-256: c55ea4a2177898b3ff26d83224dd416d69f86a163dfd26528250e1ac5d4cb8e9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised WordPress uploads or disposable hosting. This pattern suggests an attempt to lure users to potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://zonazero.es/userfiles/file/lodetimitodivox.pdf In PDF document text
    • http://adria-ex.com/zifuruwevepuvulagudobuxop.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/zuromipebaramudewosavuv.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/65343160559.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160976b6c60453---73547464423.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ec60f85a---32534243342.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8efef888d9---wajeruzevokafapem.pdfIn PDF document text
    • http://ciskmv.com/css/file/pejamujirotebovopezebaza.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/52586762105.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e824dec0c3---zofavewomowumowu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9df53660d---92824172941.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0efd2150---tixipaxaz.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/bofutagiwidukoted.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/afc418aa0da1ecf6210830d6f7a1ba2d/dadegubisafibamudir.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/73525484216.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/juwapipubiserobebupadum.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7cb7ac4be---5266025492.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/864f199eaffcd6aac6b81f16f60ab527/24072623134.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/pubabes.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/otekog06gd8qfks53ckfr1tlug/migetupazuvizikupizil.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/tabujofex.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc10a47ea---wukuvulunebopedudum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gastrocnemius+exercises+without+equipmentPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 11064 bytes
SHA-256: 420946fb1e876d49b3d13bab771e4dcc776d14ea577a7f5a390b952252131927
font_02_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 16976 bytes
SHA-256: 5bfc1586c631f0c081735104e18c7e628de5c23c087ffd50b68fb6f35a2814ca

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