Malicious PDF — malware analysis report

Static analysis result for SHA-256 162aa6e1a792a471…

MALICIOUS

PDF

209.8 KB Created: 2021-09-07 11:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f975d091adfaf17f623a8edfb1166f9 SHA-1: 16c4acb593ec389826fc0f7cef357a122503e56c SHA-256: 162aa6e1a792a4717670a3676801e26843e7950e798cebcd79fda2829420d0b0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, specifically related to payment redirection, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' and 'SE_INVOICE_LURE' heuristics. The presence of multiple external URIs, some pointing to compromised CMS upload storage, suggests an attempt to host malicious content or redirect users to fraudulent sites. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://juhaszautovill.hu/userfiles/file/99153970280.pdf In PDF document text
    • http://ourpreferred.com/userfiles/files/megusakozeketimifab.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/47931415710.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/77307866372.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fc6b461a0957ed51a16a748f93c47089/77172802703.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a2926faf4---mibasakineteno.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/vasowad.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/vinawofifub.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cc962c9fb---15496892253.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/kilibolaxizugamazaxi.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/5349525306.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609784fae57e0---dofuxitu.pdfIn PDF document text
    • https://adikmanis.com/contents/files/bamonapunorus.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/fodezijasoseluvan.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/zumevizuri.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16092e416ad878---kunidud.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/25221826809.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/91072830792.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/10259118385.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/52084463639.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/nobubegarobapixozejigoki.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa5b37aaf---livusofunedasiwar.pdfIn PDF document text
    • http://akademibt.com/resimler/files/33774014661.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/90882964550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vocabulary+building+workbook+pdfPDF 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_off0002d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE9A 19424 bytes
SHA-256: bb93c942bce26b68372f161d37dd856294e98a2776f14bf9a5961acaf312bf64
font_02_sfnt_off00032036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32036 10896 bytes
SHA-256: 2fe5659ea590a655491339ee262c95af04e6d0ca2b6c5bf54acdd0366fdb385e

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