Malicious PDF — malware analysis report

Static analysis result for SHA-256 15445405ddc34612…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 13:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3bb679ddcaca95e5af9439346f74ca4 SHA-1: 0f111f457364f22740f137d138fd960025a0c3b0 SHA-256: 15445405ddc3461251ab505d75c655e468cc39dffa1eaafdef607a1c08114f4c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://philabc.ru/uplcv?utm_term=imperial+measures+worksheet+ks2 PDF link annotation
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/65626780961.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/215d05283812f1656729dc994305634e/63176107790.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2aa8b023---59092338258.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd33a69104---gofaja.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160771d1f6d746---39303496018.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/bepimonuwiworo.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/vasijo.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/butamaboni.pdfIn PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/4346498116.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/14243559641.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/43587672272.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/259f473a31316bf4d52744e8c47773af/22485638146.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e72ffa0f329---47769336757.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/34944925613.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0da74929a---kinorevese.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a43048a6e2f---xovagamilemimewiv.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/lrj0mj8dkgblbqr51nj5bvgi3g/dejib.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/mq3qtvi7u2gso3ujcqh95bppgn/mikupewujudel.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/54754768918.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/81688942593.pdfIn PDF document text
    • http://cwesp.biz/upload/file/1962718220.pdfIn PDF document text
    • http://stisk.com/file/vubofupipejiwaxexedozof.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mtjg8cmm5smvr5uupuhuncgkd1/vedakamosin.pdfIn PDF document text
    • http://dztechfin.com/upload/file///xalibuja.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7ebd09f4d---pefawewovekinawalan.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/34161634117.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_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10764 bytes
SHA-256: bb3aeada71346ac28fb4ed6347a77fb61c4dc82b3eba1fab9acef481ef2f2667
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 16800 bytes
SHA-256: 4c507906594718f506915dd34a5bbd19d19ec10b92b8fdc6be79ae8a523f659a
font_02_sfnt_off00013280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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