Malicious PDF — malware analysis report

Static analysis result for SHA-256 715f156d3a4b44b9…

MALICIOUS

PDF

88.2 KB Created: 2021-08-19 14:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2e770ff621ce8b3eb6920ac1e0623dcb SHA-1: eeb27d7016e5b6129b900f47ceeee5ab9c51a97b SHA-256: 715f156d3a4b44b90c1f4dee208a93e6b066bfb7968d7b7c5e7a6b3f86b5e731
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns indicate an attempt to direct users to potentially harmful external resources, likely as part of a phishing or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 5

  • 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://zoekidsworld.com/userfiles/file/81509969090.pdf In PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/2374700557.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2p03g02olf8cj2j17lljt74lsf/sogopejekuzumitoxiw.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/phsr94lmllhie8qlb55tdb7jke/mezetajemezinixezowa.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c881e1f9d---78944898639.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/20209716649.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/riligitigelav.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/wegazufinujifari.pdfIn PDF document text
    • https://avenue102.com/uploads/file/dolifowomususotikeleveg.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/rirubisataxapolewi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/ferakorudijunerulatapavan.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4300c9bbf8---kovenelisaxibinusedotimi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091659a47028---vaxozagepokokopesimawazol.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c792bb84280---wisolo.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bukixokererilenozeravum.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf57ea7afa---62467663206.pdfIn PDF document text
    • http://strandedtattoo.net/file/vemerekeraxedakorev.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bcd4c985c4cd6a3cfbe95f441a8f2922/judokotodupivofedesufub.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/89492597570.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4f386311---81990601678.pdfIn PDF document text
    • http://modero.vn/upload/files/10450009737.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hqf7v8sls2ii5pt3m4jqeh9ei7/jolututijixo.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160970f4e7c6c4---wilulidegebukezovul.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lulugefidivu.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/gosigikukizagenomonaguweb.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3264846433f60d5bd92a27f308c49c75/zirirekilobexonikoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=everstart+maxx+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 18128 bytes
SHA-256: f074be966cc607404276e7274c04aeacde91dfe3061aa799dad66e93a8e8f4d1
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 10308 bytes
SHA-256: 3ec4378d76b556e62969f3c1df74bdc05e9c77c48641b613b6c157366d68dc24
font_03_sfnt_off00013a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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