Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c2dc17174ea048…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 17:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20d39e2ae173b97ccaa6edd2101ed4fb SHA-1: 197f3b92218730a59ee7c97ba01c040cef284ce2 SHA-256: 81c2dc17174ea048c8a43fe815f89b47d5c46884a3aaaa1b6e2b21c3bfb6a217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=o+orientalismo+pdf PDF link annotation
    • http://castudio.eu/userfiles/files/33468256004.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/kajezenotofewafivogasiba.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160944c7a9bc03---59085956632.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c27e3327---92199119609.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/78894890710.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/83507799096.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/66540119519.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/tobumuw.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202183147137189.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160824afba16ec---wofafu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/lakudakapipozovokad.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/jepatutikufironu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b8cf0dced---45033885956.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/afb0ddcb1ab046d14c66a48ee0da2d67/fubekerani.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/98676037316.pdfIn PDF document text
    • https://kimcert.org/E/file/29257033679.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/12006736273.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b9790d279---sawobisukonesotizig.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/erq1v6livofeeark5djjvfrlg6/vixila.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sifufojata.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_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 10684 bytes
SHA-256: 7a6b1a6fdb892703ab47d45ff1560569af9d33e3d62af3c94f81b9cfa3953f4a
font_02_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 17716 bytes
SHA-256: db1a6d03072f1a3693aaabced331bb12553d6d9fac3b09a5d43fefb791f8bfbb