Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d4cbd3c57dda0f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 20:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77dfb4824013c8020896cb0f6fe1ecbc SHA-1: 82cfe57dd368471ab846eba09cefc8fe8f7dd2c5 SHA-256: 77d4cbd3c57dda0f224730fb96942b6013185859a1db2f05c77638e14f0348e3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=buku+agama+buddha+kelas+11+pdf PDF link annotation
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3699323211---49803504035.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1f6c7e87---86980598468.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210629_0B3D4F6EBFCBE72F.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uv46q92clltgf9g2v0g4i1gjoj/59015682984.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kbbsubae94ums5ik385dgildfo/tejupejexolonotogovutisat.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da66d48e262726e1b8f0050bff8034b1/41615139284.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/plgf6vdh0gl36tf9u1mofsle8i/dubaviturifevi.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/50520712433.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/79753823721.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021061221003773499.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161091f3d9af2a---46906468027.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/gobosufuvowa.pdfIn PDF document text
    • http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/2313144924.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/kuxajovegelobeda.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/548b4508fb4281aa9edf5057ba81efbd/59237414988.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb2c912c0---54829895867.pdfIn PDF document text
    • https://armenia4d.com/contents/files/fekuxonapovuxikixon.pdfIn PDF document text
    • http://dsraxys.com/uploads/bekuzolenigimupitejanure.pdfIn PDF document text
    • https://bak.vn/upload/files/kofipajivemun.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/fvnmi9gsu063k3jpnl8o2jjvkl/mumanemuzexuxe.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/53806595241.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/78b5edb92f71604c1c2a89a33dd7bbdf/61114345702.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/pipidimelakun.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_off0000bbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE6 10868 bytes
SHA-256: 701a938d857965e8957138b2101cd21b63baa6ce84d2087e93d97f03a0d7b36e
font_01_sfnt_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 15836 bytes
SHA-256: 38427cf232c8944a4f0af5576dde610a019acbf433f636d65b27ad596e9e5d8d
font_02_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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