Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed11155334c4f077…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 16:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9049161c42ecb371bf1fdbc954209804 SHA-1: 18d8cdb73b69c20f23664734530fd2dc702ba7c2 SHA-256: ed11155334c4f077d84552281b641d23af19d164daf8b93d3d69ee7f315ecda8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the heuristics identify it as a link farm on disposable hosting, likely for distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b5d78da1---35876922658.pdf In PDF document text
    • http://m-styleauto.com/js/upload/files/xesugi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1662f8172a1f250a64f4831b7202f08f/solukujotinapu.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/ludaputolufolixi.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/mizepipisi.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210705_130821.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/26513742633.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210725_E355AFF5331B501A.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5c577331eb42f97c69f9d63d4a98a0a4/tojadubuweputokud.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2de8fadf9b1a7e46e4576d681104238d/vajixoloxepomujojewugara.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/21091830123.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed9bacd9c7---nusuduganutaz.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4803efba56ba06327db707650b58ef57/87438422558.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16119672f05c05---rutezugew.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/gexuba.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dfe20e8574872014db73494286f75cba/70428045737.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/deziwiwetufumabewirixum.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d7ce2cd4---buwaxizosunitofebuju.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/955e77a84e213f4ae55dfaf0bbcb6f1f/vizagiponidemokigebavomoj.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/sopipilojugobur.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/247o6jd95vcdklunipu0s7ihf5/31734571026.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/db3a8c136eeff2eff12a1e82cb569a35/lepagofudinatujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=if+implied+volatility+is+highPDF 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_off0000c512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC512 17700 bytes
SHA-256: 0d6c4932085aa0d612fac338b0b92aa83e92f5addda375ec2ba924c81f6f04d6
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 10872 bytes
SHA-256: a3864421c3b23eda62cc51c3a6e541a7d4d04fa0300fe7bc7c56bec47af15ae5
font_02_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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