Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ddc7d7f9140726…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 19:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80c54e9c35e126fd2b3f0dd7526b8ffb SHA-1: 7980d4aa013fd006ed2f4e5495fb5988404e958e SHA-256: 63ddc7d7f914072644365fe93452520b913dbc5e464f8ca9e210604e99b4e99a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://medvor.ru/uplcv?utm_term=baixar+curriculo+com+foto+em+pdf PDF link annotation
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609617baaed11---zewapenusorinitofi.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/foxumebe.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/18030501416.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b2c42800f---15356325175.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/kakalajisefefuliruj.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/xexetiwu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/772a042a808156968609a8cd056aa355/59206931396.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc41190b6f---68171364382.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/98415932929.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210515061323_nx7hir.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zinufedalik.pdfIn PDF document text
    • http://dentherapia.hu/files/file/xakovojomifamenuvazakibaw.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735d564fa65---nitemopokutakobiripet.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096313254136---43125807646.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/62831726950.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/28722920021.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2828cef80a511f81a49b5f442d6c6617/genevetexumekofotido.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d2a609e4---pakomexinamow.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xirutudusudavizirutoj.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/taxaxotalapobumefesek.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b50cd3e57---sakeroxisedo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-26/20210826052146327019.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_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10764 bytes
SHA-256: 198bbecf32b135b0e8913e8faf3e0e906c5efa20530db6a52e6837e1e02bc22f
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 20332 bytes
SHA-256: 6ccaaab1c575061980bbf42df233cada1b9cb298a2ce656bf308e12986e38c3f
font_02_sfnt_off0001396f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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