Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57dfccb9324fd18…

MALICIOUS

PDF

95.6 KB Created: 2021-06-26 02:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 310625b37d3f2c48b167bd0b3587bd52 SHA-1: 418738313a3708afdfb9a14f34719656d75f5ff7 SHA-256: f57dfccb9324fd1839447399dbbd5eaaa6af38d4d69593c0b47ce906a6c246ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9d92c23267cec222f5a751c46aee82bc/7987922325.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/j2um02t2oogdpo6jguk6g7pm42/darutafosud.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sowufivajukititevelup.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085eecaaf50e---75915989592.pdfIn PDF document text
    • http://i-dron.cz/data/file/98286239448.pdfIn PDF document text
    • https://kopari.hu/files/file/netixibazurajozuf.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/powavupolewidixeroxipole.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/nio040avcfqv5iu42q2f33ljmt/joxaf.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8a87a019d7389c1c6147cfdfb30f5e01/nixoxidufabaju.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/38eb1632630e466d68c87bcfbc4930b9/82460122055.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/410be04043ea0ce8a30eceb7fa7711c8/868650945.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0tel930rqtuotmluljljllo2pe/sudodevu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f5f5103979a013810f0f71f22037ef57/78646568561.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832d111829---35010556451.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/bizebavifetabowelo.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/mikiwiwepefewuxixa.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/796e70865fa7da2e64d736e66f36a835/35049211585.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/8071062a6381fb0a2740e72350479479/matoxafote.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/19716072549.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e078ceef---nazixudadufuzunezaleni.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/19193028634.pdfIn PDF document text
    • http://texmet.pl/userimages/file/gozemebogo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b2d85de9b1d534009fe57f1a2fcee667/nejibi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e781a97a---96176304351.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9e636e80173f088fa479cdae1408f18a/96894772365.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085258ad036b---sivulifegavisozefijipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=being+an+advocatePDF 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_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 10348 bytes
SHA-256: 48ed3819c70ea2970e13bd7f207f9adea28189bba87efc8dc9d988ddb2d92cfc
font_02_sfnt_off0001451d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451D 17000 bytes
SHA-256: d0e30f898a1f876b4da8bc357661475e5e04355f27d0a9b257e732cdcc0f770f

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