Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19570718e25c911…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 03:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42116a2c8a6810721f42c91bd7026f33 SHA-1: 8164a5af5bda903eae8d1449a03039cd4265c12e SHA-256: e19570718e25c911a2239e9b473de5d1228c64fa98fdf5838dabb38af3a89f9b
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. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=64+oz+water+in+litres PDF link annotation
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4a51da6b---30248418533.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2a78be3d8d94611f947ed6d9d2c168bf/zobalinasobimom.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/68752576096.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/meboxisetufozoguleraj.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/58340142475.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8374700eed51a52abd11bf1ac4f59e61/xajetoriki.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q322etsorcd94tmodvq54vuud5/17862510052.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/fosizekulakubuvuwu.pdfIn PDF document text
    • http://novafish.it/userfiles/files/15215054284.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/vepasutekof.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2153414140ff0195152f1e57f2da80a4/41907061164.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202171142029994.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/pizumurizepufepawavivek.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/badulolowibuxas.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/27561875888.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/62526487757.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/itkhdgpg5ldr28r8v5ttnnq9s0/63417645212.pdfIn PDF document text
    • https://hsse.cl/files/negikurabuzebexiseluwe.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31fc48554---15900460551.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/zadulanigegava.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b412692f7f---76011250621.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/23900592055.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ad58f339jkvg9r85vajjig67ao/bituk.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/75453061205.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/49266906170.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_off0000bc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5F 10396 bytes
SHA-256: dfaf081b5ed2df62912d4b6ffb88b76f7c99fe97ba7a9ef6f54bc50d9f9844d1
font_01_sfnt_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 17400 bytes
SHA-256: cc647f90a61961c7dae7445d321114cb87b51a159414c9db8e1a749cd6e4ce84
font_02_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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