Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d7e992c5d1c511…

MALICIOUS

PDF

79.4 KB Created: 2021-06-25 12:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95262399afbf9f95a74ea223004c36d9 SHA-1: ff72c61ce43ea150e0c9d86d861ac66fdda02f44 SHA-256: 02d7e992c5d1c5117a48982109a44e67e23ecdb0844ca8c4d7daa3fbdec72292
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No specific malware family could be identified from the available evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://maslatalaia.com/userfiles/file/96983978735.pdf
    • http://bocghedanang.com/media/ftp/file/86099044725.pdf
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/90100565369.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/478d3861a20633c5b472352e30a64cc9/73345922794.pdf
    • http://technoauto.jp/js/upload/files/88777443484.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/81cqnp331ir6g2e6d8cps7aqi3/xametenos.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/23300e3e9732471f3223e4b01e6101f0/borigikodaxemu.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c053607d2---68539665595.pdf
    • http://sillajen.com/fckeditor/_upload/file/44949656464.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cu2c7e85fco92b7sbadmass6s3/83098627.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a22f330d0d7---gofejefumotalajot.pdf
    • https://soechi.id/userfiles/file/91696707292.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/4845277312.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/g0v96uepvc8742mosa2sh1edmj/vuloxalesuxedegepiw.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ukbiq1tcvbj1d165a8cb6audu3/xanuto.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca7b618dd---veguzajulo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bb+chaudhary+political+science+book
    • 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_off0000d3f0.bin
beec4a59ed2a056b1a238447198b3bc0917dc63d940e071b8c5d4631a54b2549		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 16808 bytes
font_01_sfnt_off0000ff1b.bin
2a65cdc617f9c2e7c8b9132f77b587c3e6e750cd18dda972ecca838964e65bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 11112 bytes
font_02_sfnt_off000118cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 16792 bytes

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