Malicious PDF — malware analysis report

Static analysis result for SHA-256 33023c0b5dc633b3…

MALICIOUS

PDF

84.4 KB Created: 2021-07-29 20:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c88ddf4854f9018bf15378f966ab8ad SHA-1: 0a7927c930eee3cc2687c91b95b89e45c0baa3f9 SHA-256: 33023c0b5dc633b3c32f59cb0f6db62c3ea7a0eac4054b1ff1a4cf87e4656036
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm hosted on compromised WordPress sites suggests the document is designed to redirect users to malicious or phishing content. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript potentially facilitating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/fbc6f02064a15cdcf36676cc7acb3578/musotezusovad.pdf In PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/lakizasubopunaruj.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/26558040469.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/dezawopubuwoxujad.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504134747660.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1627269595.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aefecfcd9c8---tebivagasi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9376198ed50bdbe8e7e04841d59e0ac1/37700215564.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/zanuberofibade.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wunok.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/shc4kuvhcmb31oom4ij0uspbe3/lalowizaxomonebenorude.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/65854447839.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/60293097128.pdfIn PDF document text
    • https://susta.vn/userfiles/file/46705434497.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zivaxusi.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/kusasisijezupup.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/36632245903.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/bexulebixizajupesu.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/wafaledakowijarolat.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086de8a6a46b---gozakadikawanubezatekaja.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aff55ae6e95---sodefusugixokuna.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/savobutejevidabejufijegov.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712bfc74ffc---33439570604.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b6845b088---tugoniviga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=noun+and+noun+phrases+exercisesPDF 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 16936 bytes
SHA-256: 3beab7b7c6b48ee7a1b2e7a525dab48ad2a626a0f66eca9836458b61fa1cdb71
font_01_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE3 10648 bytes
SHA-256: f908d1f429170b99c1254a6d6769812ce4365259aa471b030dc6c712364f4616

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