Malicious PDF — malware analysis report

Static analysis result for SHA-256 55934117a29a9df2…

MALICIOUS

PDF

96.6 KB Created: 2021-08-08 14:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a84e68b903775993806b16af015b9103 SHA-1: fbb0971b08bab7cf16f1770134e1d81ae438acbc SHA-256: 55934117a29a9df2312a182bbbe8ab2ac760baa3a0de7e9478d13e16dd260c91
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9c7fd463327bdfae8435f744eaf1f111/28606406037.pdf In PDF document text
    • https://camelcarpet.org/d/files/maluwikosazokizuma.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/b83pqdco3vv7ktg5affvco6j31/wosojin.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/gonaxelosos.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/zigifilex.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a453e976b31---94975959072.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/941806fbcb62f376bc96204e2da8972c/kiwodajor.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gupefepaxizedam.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d638fc0---pupurasitulumapudenetu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76f9bd35a---24282563897.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tasagojekamatubadi.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/xikirifif.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/88dm4nmk4lct2ashoee5bnb8bd/89850384458.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/41629fec20142c9be14415ad94e9053a/55340960066.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/pikawunezal.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/73390574595.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/56b4329389ae2a63b24f1ea809e2263d/66881829357.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/21521004000.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/34446175647.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/lojatakuzivarer.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/xebapefo.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/nuxexumetadaxuritinu.pdfIn PDF document text
    • http://esejsc.com/upload/files/96779217124.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a39eb254e---44284097736.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/61690943029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+work+out+calories+from+carbs+protein+and+fatPDF 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_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 16352 bytes
SHA-256: 470e290952ef951ede6d6c7d5ca63c035db2632a033eb4bcd74a8159b858b555
font_01_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 11188 bytes
SHA-256: 3aec129b9fa9d7138762ab4fdf2355d427c0d5b74ce0e30e18498215318a822b
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 17588 bytes
SHA-256: 9437f9d5fa711644362e049a7b1a084a5962d88c6e5d2160a75d5b445d24bc06
font_03_sfnt_off0001590c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1