Malicious PDF — malware analysis report

Static analysis result for SHA-256 859691eec265eeca…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 15:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a3cbb9b64aa92f7e4a695727d6931e26 SHA-1: d172337c338e1831bf2d0f2744897951737d7a16 SHA-256: 859691eec265eeca1fa2ee7b9711cfee039874cd9f09bce751a9ade72e9e74e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to disposable or compromised hosting, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://chatsystem.site/js/ckfinder/userfiles/files/rizewozazefizusatulalizez.pdf In PDF document text
    • http://orchid-daikanyama.com/userfiles/file/xegodifosupevebewojog.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/4222952155.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/xikofebu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/3gb4ad00lg9d3efiushpl6ents/lekipavupe.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210607061415_yfe56m.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mglo0cj4ljlcm41pnqau4vmehq/muxuxuzaderusipeje.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/353cf4f935f95aed914e9330b1fb5b0f/kamekepulumaganose.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7e7a10c24db6ba90391fdb0f7adf08de/banununujaw.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/21c088e26ef4fba5886282920ee042b8/47318503974.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210607/file/50055736999.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/17244808309.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5788f72bc93d85d82ce4e4d85cfcf5ac/jilubitigotoninerusevose.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3abc58c53---vuputedomasilajogixokotom.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2810c048---35043696422.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9661fd81e0---gisixomedidomole.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a313737ac54ec1a9a45216105294a6d5/91526710068.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/30181964655.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8f6f46407ced0d37efa10c6551e42e4e/vubikovu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6bc458a4492cbebfec1de445c1667fbd/zawujunafajorumagi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5bbc59683---tujemosexobovaxed.pdfIn PDF document text
    • https://premium-house.uz/images/file/kalufiwevipefekuda.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rkh6ga9jh0cvsgmu3cvt7mu5ms/74894264986.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b719ec52f---xapanugoni.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/96754003254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jurassic+world+dinosaurs+coloring+pagesPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5eb0393b961a3ff27c8396fbe764a97b/60659744948.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_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 17880 bytes
SHA-256: 18333bae9257830dc7f60ad88efcbddaceef884fde630cb734b1aec7985fc0ba
font_01_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 10768 bytes
SHA-256: d5584a0e82837a8a788916044abdebadd8e72ae0f34ffad3814fb823d92ee063
font_02_sfnt_off00014747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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