Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f701a28064e706…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 20:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21fec26d6cb9a3d75a4a49dfd59f676d SHA-1: 5a102d12e5a46625401974d4ebf220d16c7fc472 SHA-256: 56f701a28064e706e2eba06f1a8aea375237abbadd1632774bfef471a36b72d4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to distribute or host malicious files.

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://studiocalcinoni.com/userfiles/files/mogipiwidilafegomojol.pdf In PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/wuxifepokunurakovokafiga.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/nipalexujujekuxitenusuv.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/62148120353.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/94849254438.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/gapodu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/xevarajoje.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/vuwologubaxidelikifudo.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/mapofoga.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/zoluzisalojaroneja.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/xilapesanesikuv.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b006478851---35829384129.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/fukoz.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210901114531_swuw4l.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b430ccb54e---mepuxifili.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbb42715e---41258939695.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/1377558544.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/19322895115.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/29371175823.pdfIn PDF document text
    • http://briztravel.com/upload/files/74014004958.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/fupivenaniluzuxofi.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xosonobaj.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/xejelofenolopelonarudinib.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/kapodujezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+mega+emerald+xy+cheat+codesPDF 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_off0000bfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 18628 bytes
SHA-256: 565e5e3ad206ecbf9d6e6be1d7724352534ef5cfd259e562abd4c23162d3cb24
font_02_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 11032 bytes
SHA-256: 7935e803475cf786fdae5698d8da09226e5aec09011a62991eeca31e6d820b18