Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddeb3623a1014b9…

MALICIOUS

PDF

92.2 KB Created: 2021-06-29 10:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a908ace890a3f8de117471eee1146b1d SHA-1: daaf0a91d630837ade46f2b27cd846d5a2dbdfd9 SHA-256: 3ddeb3623a1014b9c2a821769b01665a0b58babd37ae24a1728e37e73a35406f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress uploads and disposable hosting sites. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/eo27iuacv2j3nis2oltpa76qnt/62114005088.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607893d81e27c---53307303231.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c242d9d5ad3---54622421193.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/nisotejiv.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/luzomefaso.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/27386326301.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/44210078739.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/62203544691.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zedeluxugawesat.pdfIn PDF document text
    • https://wita.lt/images/files/14387082752.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ea519d2e---mazowiwumikuxefujov.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608124519d41c---sapagafitusasobedob.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/7520590621.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/21774006048396eff6deac86dbabd5fc/91402225966.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c9fd3d4d---30571473833.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d7bb8946---97749388621.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/zabibe.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210505031507174.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/66327265649.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/50442619245.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095701bc0022---59078388856.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f494e823ef---69388048590.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/dizunofubuf.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bf83ff0cd9f052bb3112d5a21fd33873/38807885240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=classic+wow+money+making+professionsPDF 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_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 16872 bytes
SHA-256: 81725de4d81ccffffd4ef9bc581bd558d09cd707aa4dddcd2bb2a37e80940259
font_02_sfnt_off000147cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CC 11048 bytes
SHA-256: 844652cfcca0eed7475ffc916cfa7260c3ea7cd95c49bd6580c00fbeb07e4587