Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0dcef1d240efd4…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 02:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eedaaa36635af242bc0c59fd0f47ac26 SHA-1: 39ebcf6bbf182a79a546040da98a3fc6ac2bf200 SHA-256: 4e0dcef1d240efd4a0d77ff84caa7c217e29b7ff8bace619fe0b6683eb770e5d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://yer-krasnodar.ru/ckfinder/userfiles/files/newiroxufe.pdf In PDF document text
    • http://alltechsro.cz/files/92194239332.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0037c7902---jogipixijo.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/jebap.pdfIn PDF document text
    • http://nfc.soo.jp/file/muvojazife.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/57673810717.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/244cfe9e061e275ec98ed6c6e5e5ea68/dupibuk.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/39592246985.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/2613561045.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/61506885483.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/85340253935.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/nuxovo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a4bbc8a7---vozisanexobumal.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/65cb387978a087fc8fe5b3709e6ae490/susagebajopuva.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/77556187088.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e7e70732156491f49376c6f9b68a858b/zemufexaki.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/43282361554.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/87934247055.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/66161932408.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3a013c9db93b8197add9003f453ac924/69849220943.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/wivubibo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e584779ec---67942854024.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xujufiwutepizipeniveduzat.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/8639447075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=god+mode+black+ops+2+zombiesPDF 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_off0000b8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 15832 bytes
SHA-256: e37e98221e074726743952ffb088c6382894f4d59eed4d59cb1a37c3a99453c4
font_02_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 10824 bytes
SHA-256: a9341eebd0cc65e3e82821446422d47da9bb041566190660bd7d73eaefebe973

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