Malicious PDF — malware analysis report

Static analysis result for SHA-256 e305804ca7dbc025…

MALICIOUS

PDF

82.8 KB Created: 2021-07-30 07:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5ced896f629a3ffc4a9f7c2e5054f6b SHA-1: a40bf33dd1cfabfe700e7842f75e434b4299e4d9 SHA-256: e305804ca7dbc025a3d110c84085d3ed63b461933f4fcd6d7dcea7ac5bc4dbf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to download further payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://wastran.ru/uplcv?utm_term=principles+of+cognitive+neuroscience+pdf+download PDF link annotation
    • http://angarakshaksecurity.com/userfiles/file/betax.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/musoba.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/9524294089.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/dafiju.pdfIn PDF document text
    • https://aashianarealty.com/file/jebub.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608de25784131---gipegakekebofunaguvatub.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/6646351331.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ga8kdpccvp3gbe4c6k760amcu2/62839819674.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/45204870864.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/67688756056.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/rufafukin.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n9902d6s7ctki4kmjhiafr75o5/47709964999.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/366d34585fac85c8a97dd6825a05373e/86203345558.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908156d6d7a---57198126339.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5cb50eeb9---pikuxibidepenedolifo.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/salijiduduma.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/95160810038.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c73768bd376---zevosufe.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce2028750f---teziginokowesizub.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bv757jafc5scs2gn596f2cfd8u/21753249405.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/06b8968221061e55716cd018ce1178e7/46428989977.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/gokedusibirag.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b65652be9---32549859795.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5abada7221---nesexapuxiwuwat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 11048 bytes
SHA-256: c18920a9b5b48df0a1c92f1d9f73641a95acf416bb8919aabc666995c3a5f26f
font_02_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 17068 bytes
SHA-256: f3243961182f107ddb031da667257b9fcc4edc6eccfc5642440c0474e668eb02
font_03_sfnt_off00013429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13429 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500

Open this report in the interactive analyzer, or submit your own file for analysis.