Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdecd1585e5ce42a…

MALICIOUS

PDF

74.7 KB Created: 2021-05-31 08:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02146b11c03fa31a07f80c99dc110546 SHA-1: 77c6a9c56a961db5577fda0ef1ec684d4aae2a81 SHA-256: bdecd1585e5ce42ac6bbd42d4e5de1341ef1d39e214f618bb0a903f309fddb1d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URI heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=la+classe+de+stef+histoire+cm2
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef4019c96---wenaxodusomakerir.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fed01e9b475e91dab045d094e5cb9df4/pejusolelapu.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ddb2c207f---60490049860.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3a8bk12svfbklo7le127s22fmh/zemepej.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/jjgrf9svie6pee8cnl4r8emjdl/dekomitozuz.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb0719ab2c---18832937140.pdf
    • http://magendans.com/imagefiles/file/38175764308.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/mdtfnh9baa8qrgjreun8ltpog2/mosanegapalujurivemema.pdf
    • https://communeouchamps.fr/userfiles/file/tilegejokegozona.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0310b113c---82972755611.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6cbd95dc0---7583904992.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/5fcc04bef8e4efaa11b838ee665d4940/nusefopakamoniromijixej.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/79086120105.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613e6e04e2---39528004190.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a496e8438---9958703527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da93.bin
4ccf453c7a1f248ec84f1784cbe49f225edd8c8c64f63016b10849ed468815f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 5016 bytes
font_01_sfnt_off0000eb99.bin
aeda245817c381c9b2f2ff37028c45ff2b6308a71f842fce6b12be7f23cdf482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 12540 bytes
font_02_sfnt_off00011303.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 4324 bytes

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