Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76709def0bc5fca…

MALICIOUS

PDF

147.2 KB Created: 2021-09-03 16:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c9f7dd98e9e1692ab605ef1046ff6e1c SHA-1: 8df11ce34e062df42b63334d3b3406d3f2678ae7 SHA-256: f76709def0bc5fca5853d43ea6ecf97e5605a7e452449e8a5fc7858bc6f53efd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pistant.ru/uplcv?utm_term=hist%C3%B3ria+da+reforma+protestante+pdf PDF link annotation
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc8ff77efa---91874797921.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/53777765314.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/85575994290.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b92763b094---58715155138.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/14898519581.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/31671032604.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/73616377163.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/rn6v19lt1fcpdufehg6uf0jt5i/28968827382.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32eae1a573---47401104813.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/83465928066.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/69464071784.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e9ac05f262d63ed237ee00599b513fe9/97155054325.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/10701716817.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609457f9823cf---92284752655.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/futafarepometiseb.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/kuromekitiruwawewaguxep.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/77567928449.pdfIn PDF document text
    • http://evola.it/userfiles/files/38161109563.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/74902004712.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/57b9810df41b8d3ff4290fe33873bed6/50339921402.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e27cc98c9---53537982672.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a997d04eccc---sokefurovigazuta.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/dazugaziso.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_off0001d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D251 23040 bytes
SHA-256: 65cbe0a83397055758dff83051d2f3e673fd9612cdbdf4966f1ebfcfeb2d4334
font_01_sfnt_off00020c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22470 10744 bytes
SHA-256: f43e4ca5095a3e3fe4fa1298800266ca63fbdb38096bc6c49e6cfc9aaf00e6db

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