Malicious PDF — malware analysis report

Static analysis result for SHA-256 88231a4de72d3328…

MALICIOUS

PDF

163.3 KB Created: 2021-06-29 20:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 394f5db65c0f80290160a0e0aa440c1e SHA-1: 2288c3c5e2ba2e495b7b34580c17dce56ec816c3 SHA-256: 88231a4de72d332856efefa74a5ea6e68410ed521c0c759d241910f32b4d6d7c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/st05h7fcielbl4acgnuohnfs15/28286482436.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160730d7bb7fdb---dafudumizinebikelopuj.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb704eb94---70110501545.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/6455f9ca7bb3a86014bb93001f882cf6/48055194344.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb5522301---4490151325.pdfIn PDF document text
    • https://tomas-music.com/contents//files/vigopuvajabutofodumigijip.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/mumidusisavuwopagesonivum.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160918bc70a3b8---xufatogukuxixamu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cfb26351add9a2130ffc5589003110d3/jonufikob.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/97497243400.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d7afbb299---putejuxuneki.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd04e78de2---sakiliduzo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729c7d8b058---gamoninijusabigi.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6b4ee17b---11623116525.pdfIn PDF document text
    • https://arerp.kr/data/file///gifudavekenajulenevoxiwip.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b8802dbba42408fffa82e4386ccb8795/84297307836.pdfIn PDF document text
    • http://allasclub.com/campannas/file/golebijepe.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zanit.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b13f6ed6ea6b854d3539014fb288e4cb/83941927741.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/muzokisasogego.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/50d0eac6535ae0ddad20c9706573857f/juguzomaso.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0a61a6eb817d2d297b1e659f8482e535/82580507717.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdv1ua3vfhnhbk0eos8389j68e/28503472399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=father+of+solomon+in+the+biblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F672 10596 bytes
SHA-256: 9c1eb2bbf785845849f69a4f04c3e46c4bad11f5178924ac07bf03070beddc56
font_01_sfnt_off00020e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22683 21464 bytes
SHA-256: 9d157d3140c72b77c4c8b7cb517b7ca212564d62921f5b37bec24fad8f5126b8
font_03_sfnt_off00025c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C7D 19836 bytes
SHA-256: 9a7fb6d3c29c7754f5df5df634b354e7dcf950dea21c338829d0fbee5bc500db

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