Malicious PDF — malware analysis report

Static analysis result for SHA-256 1119d233ccaf8535…

MALICIOUS

PDF

91.2 KB Created: 2021-08-21 05:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1518962c11b375b556e4b076e2076cf8 SHA-1: ac304ca83781d3d612184cd6088faa53e182b9fc SHA-256: 1119d233ccaf8535cdbd3ca678e0be7d2d25664b2a38d10a23f84c6497b25a58
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/61cf32214ea6266e1caa398a16b240f6/vifemujijotip.pdf In PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d369277e50---lumigupepetesukugodi.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/fepajezuxebabilunuze.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c86b867f51---joropefesor.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/xobojegukapuresisikavi.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/dcb0ab96c3656d4baa168485a0b977f1/42460046108.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/12493073887.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e7284ae28036e52d3674018a48554442/fesozux.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/e1776a02465206deb1ab16539c6c93a4/61386796328.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/86096299467.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0fc0683f---16981843683.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/rutis.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/5360694573.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/pinunerobufolinawimapipok.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/sebijela.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b6d09c8a---5240396443.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/bef32e3b2557e87a37ef5638ef304a8e/22176156993.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7a7daf75---75444507685.pdfIn PDF document text
    • https://tepihtrava.rs//files/10446293260.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/608db4lg6hil1m0l23flfnj237/71407833149.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e36543fda---99292252362.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/towaribakekifiw.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/13362789175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=a+puro+corazon+capitulo+2+vimeoPDF 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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 4172 bytes
SHA-256: c2b3ef57c2b9205409b925e142927ddd58b37d0baedd19195b020d3d7daf4317
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10696 bytes
SHA-256: 9bd2209aa2bb71c142297d736590c9ff80b6925bd0f4853af3d09b2d5c3924dc
font_02_sfnt_off000115d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 18024 bytes
SHA-256: 5f9a8d182c2958b5c8ad82f7dd5ee4ab86f6eaf09c29ba443b56706068227abb
font_03_sfnt_off0001441d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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