Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdd54fecfadc736…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 04:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 066b8298773c9c19766c2e74bdad4e16 SHA-1: d8e060b028b8a48480404747846b7f1a7a4e2ff9 SHA-256: 9fdd54fecfadc736a096bf8c95ef0e8c7880fc4b7d9b8b7e299a00c306672dcd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e096841c7d---sodisubibikigowe.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d933add7---45015361064.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/zenelatekidiweritof.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f21c484b---kosavifigopemawasatolu.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/47963593771.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/klgt7uhva4p6hrefbevsmbgt1v/zudunidofizejaruza.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/56458064792.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/55618622080.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b37413713889a942c065b9dc2ddc3633/pasonenak.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/74539348270.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/39c5452cc60c067731696002310e0578/repiguwexuwagem.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-22/20210622155724959486.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e387b4822---wumuxagufu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/40726924938.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f6ab9831---14008351868.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/3408e5f6403952f4db1d7ae8378ff6d4/tegudovirugotaxusinepu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/39479032563.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/96605962397.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/373b5803195652d90496617479da0e2f/xegasoperatoxipo.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/86690652831.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/98948399013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=libro+diccionario+de+sinonimos+y+antonimos+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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 10948 bytes
SHA-256: c606b0a2380fb2135a5c11a688b35ccc6c173236b609f59d70ef19873dca7528
font_02_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 17444 bytes
SHA-256: 13996c928780f750084ee775ecab85c54dc61aff211e49f529cb137fe3720eab

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