Malicious PDF — malware analysis report

Static analysis result for SHA-256 3719d7a83a3c35cd…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 17:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d28eb6e8da6f4cc20506a981efb52f42 SHA-1: fcc1dd90cc285f837de8fc51ac5d14fb67a6ac63 SHA-256: 3719d7a83a3c35cd1d4a047ea3bda16dfd085d21cbec998f39191f34df0fe500
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=save+photoshop+file+as+pdf+with+crop+marks PDF link annotation
    • https://jotekonybakterium.hu/userfiles/files/15567191481.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/43396433081.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/vutol.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc3c6cd2df---wifepujiv.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be874a37838---paxenagisurapeko.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3a907cb87223652b573938f5f74f5870/570926083.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/teginigavodilexun.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16091b3ff406b1---48629439523.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/xuvisinuzatopaxi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/351e12fec10c1ac145bd9c45276d50fd/givabavuzujidiluvutavuwa.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0999782e455d6b63837c0d947f04f06b/zekezatumi.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/zakolunojedexit.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/18906546172.pdfIn PDF document text
    • http://dges.in/userfiles/file/kugunazekazenoxodusijef.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/livurunaxokiriga.pdfIn PDF document text
    • http://cochemical.com/upload/files/51022639410.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c55fdc61b---53162700839.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/35492678865.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/74684278173.pdfIn PDF document text
    • https://msiutilities.net/documents/89718950028.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/76706424683.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052611234773499.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/taxuwepelukudatuvo.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d9bfb7a62ed1354c7a51eb5451d68a62/fuzifuligewirowewovufi.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_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 17224 bytes
SHA-256: 199b92d7f24c1b7a3104829f13dfb045d29d41da496af0a64f0368eddbe715c0
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 11100 bytes
SHA-256: 2ab1def2d2ce27581dd0016f0a8fd7a639be2fbe24215a2a5f6a2e416057c29d
font_02_sfnt_off00011689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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