Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93f30a43fc6140b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 23:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3889355da963ff59b9fb2d570acd3757 SHA-1: 99ecfaa1a95b7d811cdae08dc1659b23456c334e SHA-256: e93f30a43fc6140b3c5b178a5720f5d3e8f1e40bb91f440b3b4489a9857fd0f9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting. This suggests the document is designed to act as a lure, redirecting users through a link farm to potentially malicious content or further stages of an attack. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/k9n55khvepfpp230ie7cpe2uu7/xeborujobelitifosulag.pdf In PDF document text
    • http://kenshopvn.com/uploads/files/10669451579.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/60353740042.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999c0609ad2---32695297579.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/28151202997.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hn9gs0b9oeqrp1n1ai87h7m80k/lijato.pdfIn PDF document text
    • https://tl-systems.hu/files/files/gixetakubotarupugefudusi.pdfIn PDF document text
    • http://theultimatemarketingsystem.com/survey/userfiles/files/36112813637.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jif26vru84mvocabgca4ihopip/livizogudidipokafusen.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/benisuvozamanuvokevaposu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0464d0794b6bd115d06a4287f8de662e/jogez.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/21785734941.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/51774670877.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/zerobolimu.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7496pe8d22ghgf49p64mva5h6/pamisipijowalevexev.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/29855482347.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/52051598678.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/fawaxusobebeninasilup.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/18666912386.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/suboliravesuzakumu.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/71433378325.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b728c2bb27f7e4bf6bbf0e3499760c16/tidiwujegitatesakagefam.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/3761249572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=english+slang+expression+pdfPDF 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_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 18936 bytes
SHA-256: acf9e39c66f112b3acf840fa12d76abca80bee2258f69893bfd504350c57b490
font_01_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 10764 bytes
SHA-256: ad80be56d96a73ed6185326ccaace27a7593bbd2f3e210fb4db7850d98371c44

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