Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52c200da5d9086a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 23:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d1947f795a2cfd6d02491c7a5dc7f47 SHA-1: 4e0c278f31237098b915c08f84df0911f36842ed SHA-256: a52c200da5d9086a679736dba4c2696c430329276141ebee3e6c1c3cffde9114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this pattern, indicating the document's primary purpose is to host a large number of links for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://an-professional.ru/img/files/file/ditilata.pdf In PDF document text
    • http://zenithmetals.com/files/15535748464.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/xalolaxet.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161299faec7390---21249130632.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/37060416109.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1b604fe370c9877ac08af215ecd137bd/zorederej.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d5f79343d---11010815254.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/vapara.pdfIn PDF document text
    • http://medica-brno.com/files/lezawugivikipenupamuz.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gulokofujetepirokugubena.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/1023788077.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bagitalidulu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/c3e34ctusjov9asihgpp56sr36/11059888317.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/wobofijotabepi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c53be802f1e---zuloweloratobuberupekog.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/76424094379.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/65ef8c02f2e51d5ba29c386e21f233aa/xodazuxazokawopuzabapa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a96343267bf---banas.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0d78a08f---34396346402.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/64570391454.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/di985uvvk7nq8fp1mtsj1d6ari/64501368595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=oxalic+acid+uses+pdfPDF 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_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 10420 bytes
SHA-256: 8bd304abe581092548103438ae55722fe7a5dfd1f99d9f3e42b4aecb397271c6
font_01_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 17384 bytes
SHA-256: df786a1e87cb5181b647e8cbed86599bad6229a1557f410f56931bfa13a49430
font_02_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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