Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3443c235217e5b…

MALICIOUS

PDF

93.1 KB Created: 2021-06-29 19:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98c876b989ae134facc96c36b19237f1 SHA-1: 55c87f7a7df823f6b2efce6c36a82a0762031e57 SHA-256: 5a3443c235217e5bd9f192556f674369e249c06c52f7f8c3c0d29172b23776fd
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 pointing 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 the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=mech+arena+unlimited+money
    • https://anthonygillant.com/userfiles/file/jadewogukorawovufi.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fb10a44b---26672258933.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd4a5234e---losodaxejujin.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/adec48d2e7c04d6379c398ddb1e10f97/dawexopinipotowov.pdf
    • http://hodinovysoused.cz/upload/file/misabekiwuvepuwek.pdf
    • https://faprosid.com/file/ralaxisonizuvogo.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3b647cd9---47132996743.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/9h175tata7h3jf44262gt64mhc/83606236540.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/drcsk0l166jvkkndtgao55ge53/78292666054.pdf
    • https://fzclicks.com/demo/files/editor/file/235884572.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2138ad145e6d7b368dbebd445853b75a/35835328029.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f1dacb738199950f9e9166701b1648a8/kifozuroxikefumijefubaj.pdf
    • http://kompletucetnictvi.cz/files/file/xukobivotugavuzep.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/am8jn2l8e9fkohm6thb9cr0op6/83108575978.pdf
    • http://seoulsquare.com/userfiles/file/gisogemufawisetix.pdf
    • http://superlitefan.com/uploads/files/vusuvogutibenage.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fafb41aa6---detiduw.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/m2gjulm9p8pa0eltt0u5j9vn10/tuseruvunomubekedawarog.pdf
    • http://airelimpio.mx/img/editor/file/60860500203.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/t8f7bfife7cl60rp5bejhrdvou/ludetojulafutisu.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/24f1c75451f8c0ff10667330c18b0eee/zovosejekuwutebodopo.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c271015a058---gifoduligub.pdf
    • https://airshow-bg.com/file/7760480020.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8aeef5f5---wuvasabiki.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2a7175df57c478e9758816bf2f530362/napebatazenajigomugi.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_off0000ff43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 16792 bytes
font_01_sfnt_off0001175a.bin
03c6d2aea57662d3af2717ca52f5f10c495607a72292cfcc7d81c5d63ff67a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 10672 bytes
font_02_sfnt_off00012f98.bin
c6aee58d62eb23b8240c8db1f0d607f54d8190caab4b06f0896b17fe3a021932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 27560 bytes

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