Malicious PDF — malware analysis report

Static analysis result for SHA-256 23be4cfccf4c4159…

MALICIOUS

PDF

93.7 KB Created: 2021-07-13 17:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5093dff2847ccd6cfe8bda17e19a06a0 SHA-1: fa84766d5ecd72ce2f0b12aa402142548740ad82 SHA-256: 23be4cfccf4c41599f737de2b2a7016eefcc9582ff9326fd345a82478579390f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/im9mrg5hshqdg0aidja2kcdcc6/tarusofomejero.pdf In PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/2c70aee78061894131a5e57744af5655/wokenutaboxut.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/32258112340.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8e0ded61961df87f1cebc3c9193916f8/83870217401.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/kexexowavomowus.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/5709880281.pdfIn PDF document text
    • https://teddybestore.it/file/20309869102.pdfIn PDF document text
    • https://wittnebel.dk/file/jotuwiduximedulutigemew.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/46375192076.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/12134375067.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ad494fe4dc2659a084cda7660f6c3b84/fozesa.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae1ea37595---62507261326.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/madelitanarige.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/37732619565.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4f997576---tamaxitesizefa.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/upv8jat98tsf94v1kc5qvfugpk/pajurunigatonepodoro.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/tusebamepo.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/27397710078.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c139jp2t8pfbptjkksi4rtalk1/28005824262.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/663c2fddde50934d93fd2f1b34fc847b/vokusotazedoduxojime.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a18dc7e4---20262013175.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/khhtu7von6stbpqc8v1oek61q0/67592062957.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/26b0856e381d5fd8c68cb021e088a84d/90423429726.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/milajubuvedajewezadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+do+i+feed+my+snakePDF 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_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 10672 bytes
SHA-256: 45160d89ddbf565fc557ad48dbed0eec4f53a11133d371a402d7953b4f6c683d
font_01_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 17496 bytes
SHA-256: d883852f99033bdc4a98541b311d258b972848b0eb054d8355230d177e6c7d11
font_02_sfnt_off00015188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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