Malicious PDF — malware analysis report

Static analysis result for SHA-256 54153eac7f3976c0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 18:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14ef3f39663ba27074ed9217453bdc6e SHA-1: 3e4d4375233f42237b8208b2032b6ff5a992aee3 SHA-256: 54153eac7f3976c02f0683f30ea0134ae33cee3e4b69e736a61923dc62144bc0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate the download of a second-stage payload or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eletmodguru.hu/files/files/fodawazinebonudolak.pdf In PDF document text
    • https://everestart.com/images/stories/file/49808125736.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5526da714483772c838828b5dfdc15b1/zituba.pdfIn PDF document text
    • https://parfumzone.ro/files/file/6780455142.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/15086081846142f3112e5ac.pdfIn PDF document text
    • https://festacontinua.it/public/file/wigefekuba.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/78306674442.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/xadepaxiz.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/jesukavexemokididipureru.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/3218915579.pdfIn PDF document text
    • http://tiquital.com/documentos/file/nugotifijiruzike.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/fazin.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/40985440205.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/93528178483.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631944845.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/pesopapawoporodizalute.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911135944697453.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/19f9cc1ba192ecd15c351ae368d6b743/medizozudikemapozigusa.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bac5d55447e36a91c331c458958f73f3/16732887134.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/mewilewuf.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/mofusabusedoxe.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/zaxuzogevuvinaweka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=yts+movie+browser+apk+latest+versionPDF 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_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 17604 bytes
SHA-256: 627a7712a553b49ec5aa4590f4bc09f1ad81c2442c63ccb5de26c762fe52711b
font_02_sfnt_off00011683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 10780 bytes
SHA-256: a83c9ee57820ddf86a3466a8f188b392f61229dcda531d2d36772260e471b144

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