Malicious PDF — malware analysis report

Static analysis result for SHA-256 da26f6a8c99aac9f…

MALICIOUS

PDF

101.2 KB Created: 2021-07-17 22:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ad839923379822fa6bbca81a50ba0d0b SHA-1: 30ca9db4fec6712045bb719a11bc9880352d355e SHA-256: da26f6a8c99aac9f8ec8a2b1dc711194aaeb8418e9341f0f8c6ebbd9e6c33a82
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, many pointing to compromised CMS uploads and forming a link farm, suggests an attempt to redirect users to malicious sites. The ML classifier strongly indicates malicious intent, and the overall structure points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/097cc5d7930ec9dc8666aacc205a29a7/kimikedetisaviginoxix.pdf In PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6de0f7be827513872bc0e05ce5c17801/rodunoxudewo.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/5289200211.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/60427530714.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9387bb42---82888342426.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2895068d54---97520680926.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5e1355356---nunuwegozupu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f762d256d0---letugegebekuredir.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e217cef860---tadidame.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/lerasanopamemetenozibofo.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/62009755948.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/25a6541630592e67478d066e232aaa49/mivuje.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/kunawikabixivanov.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c01c22177---10542941214.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/5a9712fa4038fd47d06e481e733bc69a/kijapobodowowazozewid.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1e204bu45uvmlfue8ek4n5n246/14382025096.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8919877f69d23a37ea1fe1feef8aee13/53087848347.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/bewodezujibilo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4f1324ec1c57434e568f0adeb09735b2/78888523950.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86dc94f4f---jexawiledifo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/26bd1edd3b07f8b6526a2d9ad854fdfb/fabugevuvirobadagifoxejul.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/fesivosunununozitubiwanu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/65000586592.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/depolara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sea+of+thieves+free+code+2020PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/01433efb96cbe437068faea9d996f4e5/72421970153.pdfIn PDF document text
    • 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_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 10804 bytes
SHA-256: e20797f776fff0f394afdeb7b3159ab63c7ef998b46af5d25e2f7e4ea9552ff7
font_01_sfnt_off00013c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001547d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547D 19528 bytes
SHA-256: f8d38444c454cd748efd4cefc3946c113e6fd2f13fa15422bb31660ffd6418ea

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