Malicious PDF — malware analysis report

Static analysis result for SHA-256 e019acca35286ca0…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 18:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02ba008b95752dbd169a766d32659f36 SHA-1: 3076c46d8345cf876da2bf7a4ff34986c3241b61 SHA-256: e019acca35286ca002d976682613d927e83cbea8785e30968d7a54c63b4b7896
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it functions as a link farm, directing users to various domains, some of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure points to an attempt to lure users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://martonaroniskola.net/userfiles/file/72920820268.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4e63e8dc3---biwimiribedotibu.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/vajumenenagamenud.pdfIn PDF document text
    • https://coluer.ir/documents/file/mafenujetobomosuwumipad.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/36543373870.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/78281798858.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074366be140b.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/zisidarivunedimezowige.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77d5ca3026---4196410061.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/zunepan.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/judubopekibodulajav.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/69074542381.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/24008235977.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b45837eaf---larizepenerisemelo.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e860fbed5f---79995660053.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/27jq51gjalou9ghu1vrrejgo16/jagij.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/giwujategabunafegukapa.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/13204551077.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/87824187141.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/9837853448.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/98926045261.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7nqq84keovsqjbk8oh7oqilomi/72736848577.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7b8e60bca5d6ac1014eb988cda98fb90/28765054138.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/mumenil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pulse+code+modulation+adalah+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_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 16856 bytes
SHA-256: 040a6eeaf5694e8153d9da24dcff6f7b7875cec08ee859275fbf816d2b728961
font_02_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 10888 bytes
SHA-256: 9f5f0fd18db169fe587d7a6406f2b4722f9328435e065e1a92bf876dbcf29c89