Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16b96a180d52229…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 15:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 392ff694f2b0bdfb6b414979a418fd48 SHA-1: a126b34ea32f4e6c09ca37acec93f78bfadc67aa SHA-256: e16b96a180d522298a5dbac92359eccc4d140a6b8496222956618c82fecc0b98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=gate+computer+science+question+paper
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609181501f89d---kamubunagu.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aad8b046f---gamiketekilepukaxi.pdf
    • http://banphimchuot.com/userfiles/file/regavurutog.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ain69nke6a5ubhh5ahoddjirrr/nopekupimatuke.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/voriviponevoneloxenev.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160790b5cbffc7---91153832400.pdf
    • http://bafiti.com/sklep/userfiles/file/66097385335.pdf
    • https://akapacha.com/userfiles/file/mafosajawujofeporilegu.pdf
    • http://okfilm.kr/userData/board/file/lenamutazusumetasov.pdf
    • http://myxroad.com/upload/userfiles/file///24938040599.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533a8e78ac---34791570752.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee5fa8b2b7---70450252612.pdf
    • http://rld-carbon.ru/file/vowenazuwaxonanaris.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d792ebbface9abbd25f337d14ea2b8c5/tedepovapabezavomi.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ad97e0de---dosurisozosepi.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb304086d38---62379937921.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f361.bin
da3c51f3624b3472373531c0de7a4d7abed827e20a4f0c6784a19183918dda37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 10776 bytes
font_01_sfnt_off00010c33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 16792 bytes
font_02_sfnt_off00012445.bin
b5798d5f4f4cddd44b9f67a92eeb1b75c85e93b5a617dec9253d1d604476dca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 17728 bytes

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