Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5c904261b7a982…

MALICIOUS

PDF

91.9 KB Created: 2021-07-17 17:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 383e591a53b9d43493e050af0933e483 SHA-1: b3d9940d64f32ca971e272d641e467c9d24f4068 SHA-256: fd5c904261b7a9821cd9fd57387a55941cf3d486b22a8cabbf70ed903f38b2cf
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a likely attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a document designed to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f9964d75---30227858417.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608992f83a22d---tuboxorasudapojo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9149b23079---11036994483.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160777b16c6745---dubolijebosazer.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/41511454336.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a3ca22e1---96484962581.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16092557a9c963---zowefajo.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/46338441377.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d1a18e3b820713cd7e64d7e99ec356f5/nazamofen.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/72gdj1rdqv5f1b1t4mf35oadjp/vobiluvu.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/31607131597.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/webesagalexugevusazovikif.pdfIn PDF document text
    • https://majubesar.info/contents//files/banapil.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b372e317f65---31877366927.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/jagedilitagaradosaguxafo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c2035c94e---naxakexo.pdfIn PDF document text
    • https://slide-bearing.com/d/files/gobive.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/cb00e117c27e522fc5755d87a322dd71/36948926112.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b56dcb77c2b---99677827444.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/65033877115.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99852554f---fukomirijibasupejazofijoj.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160863e2801c2c---64171000894.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab93932916---vawagim.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/68569322402.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/vadexofebozomakazef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=first+and+second+law+of+thermodynamicsPDF 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_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 10916 bytes
SHA-256: 8fb81510dff17fb7228757104256cdf180e4e030a1275b226fc4d9ddfec3def2
font_01_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 17184 bytes
SHA-256: 45c7aee7c61d50e05e7d2291787a3cf8fd30ab24f46c74e6aa596b19c8b25cdc
font_02_sfnt_off00014a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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