Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9279685f5433220…

MALICIOUS

PDF

91.9 KB Created: 2021-08-02 01:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6bf16260a21d2d30dae30f928614a830 SHA-1: d2fd763d8296d5d3ea21709d637b6eeec69ed5a3 SHA-256: f9279685f543322022bac96831132602d148b9840bcdfaab6943c296623d845a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to other PDFs hosted on compromised websites, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the nature of the links and the PDF structure point towards exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=clue+fx+board+game+instructions PDF link annotation
    • http://bertoniamministrazione.it/bertoni/public/file/jogefonaw.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hh33a4hn53mgbgnns8h5eum4fh/93835057017.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/43847620949.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bbb078c672108c814ccc8b0a85386317/domesufo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5002e07bf6---pireluzidesike.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6bfef1a34---sunigusa.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wizazabimefuna.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/27520484879.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4619418215---54457897200.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f1a22355---tuwigevop.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519174945386820.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/da1e7f8855758e4d79b5e6f0ae10a162/junatajadukajaxowur.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf16a7b108---72799661210.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36e2e663162558d082c87eecd943cc8a/batufinux.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210802044405.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/47205696910.pdfIn PDF document text
    • https://keongracun.org/contents//files/bofajodapudubugubirozo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/12192a5b57f9b1300564bd62653c43b3/mifajanafo.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/bolefoku.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/96994865196.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/41e2bd8fcfe696fe750825364283d056/lakiku.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/9d03c7986fd8ba41511a657025aa51c5/wuritavutemifamifabadaxa.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/bulalafanumanogixon.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/wawoz.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/pumavixabuxuzo.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xetosu.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_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 11192 bytes
SHA-256: 50b9c6140bf0a820124608202281703069b92e4e09e3f05b398e6d0a950ac00f
font_02_sfnt_off0001361e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361E 17032 bytes
SHA-256: 3a4472e007adf2d5cdef8464c455e0e0b158e42951c8497c43dbbd5285af2886

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