Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5c3ca4de9d168a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 13:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0d89fc2a0156183effb9b03f59cce65 SHA-1: a927f52a9ae5cc96a2cb12dc2bd3507a6e5b9e61 SHA-256: 6c5c3ca4de9d168ac8a6bc4743d243927aa5d5d77f3c19025b8d3b762b2a01f7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure suggests a malicious document intended to redirect users to potentially harmful sites, possibly as part of a phishing or SEO poisoning scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://studiotecnicopinto.it/userfiles/files/4966502200.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6169ed9637---laveka.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/24820250713.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/wopavaxujemexijo.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/80512129900.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nuzoduwijulij.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3734a9954---karikokali.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bfffe2ada---pejafurudojufopore.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/fufiravokejivadibur.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c22b2b51---fifasilogupigevukemanuk.pdfIn PDF document text
    • http://caramelitos.sk/files/zoduvomorebawijowijalo.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dikotutogeludifis.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a77bebabb814885fa87dd9f78771ed4e/zatokoxalaf.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202108282200268673.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/53303133849.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dimanadodig.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/mazoludefataxudapeti.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/fetegopurefonavoxebim.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/supikitamujebilanu.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/zilukaberutavonutifi.pdfIn PDF document text
    • https://manenshop.com/upload/files/52860219850.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-24/20210824080950554242.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030fd33df2f---82005558886.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/dagivetefitulunilifoput.pdfIn PDF document text
    • https://actor-conseil.com/files/file/71721981097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+many+types+of+pumps+pdfPDF 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_off0000bf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1D 10712 bytes
SHA-256: 9b7ef4311760b8bc3d6e19f5e45acbca67b35161f0c6282c12a3d5b288a1c9da
font_01_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 16216 bytes
SHA-256: 6f943698a1c0f61e9122ea64c9f62b63bfa651d25e82327621d4ec14c2a18230
font_02_sfnt_off000100ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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