Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d563850f4be12ce…

MALICIOUS

PDF

85.5 KB Created: 2021-08-16 22:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2300b449619c8324c5c56a909a2b0e16 SHA-1: 8cd8b6b9adb864b232e7c3849b22ea6dca14bbc4 SHA-256: 7d563850f4be12cedb0c064c2bc5742a5d4807dd343c22fbf46f45d9428ae509
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. No scripts were extracted, but the presence of a link farm and the detection signatures strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/035u37mvg9at6675tqk73676k2/pajepe.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/3p16s2braur49rpm1jdb049v7i/76986534117.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/gotakafok.pdfIn PDF document text
    • http://usa-ex.com/images/blog//file/48988504990.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/mokisulivafamo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a12e7e18ac8---nixasarutafozove.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609904c60fa51---89228447035.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/41727871005.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c69dcb43---78642356191.pdfIn PDF document text
    • http://htwy.com/upload/file/39201441545.pdfIn PDF document text
    • http://abpaluso.com/upload/file/19092681166.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077926582e93---raxuworewiruxajuvak.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/xewurotukamasumarovexaro.pdfIn PDF document text
    • https://pecsikult.hu/files/file/mazarejevameri.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/dolovomenodomoziz.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1628334378_ece53a828f.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/700008615.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fd7dc4de8bfa3060d55647e9b8b08739/lurimidabazajogupobeju.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/132bb64a79bb2198722abda011e4ba51/bemutupiramif.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a9df1f61f9cdacd550712ff30493122f/fuxuvolefadubo.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/bepitawogokofejanugebesim.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/fivov.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/tisiwifunuxezebiwig.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/selonomiwujipag.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/63915585331.pdfIn PDF document text
    • http://dsagco.com/Upload/file/90825740648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=barrancos+mooney+operatoria+dental+pdf+descargar+gratisPDF 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_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 20444 bytes
SHA-256: b82019eebc38d4f400bb4f0c99310b080362b126a47ce629702d2fc2bbcc7ca2
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 11128 bytes
SHA-256: f7ca08b59b58a9b3a0c462981777c4e9427cba05d31b58d90c9cafab47452ddb

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