Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a832e2e2d871e0f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 02:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa4b6229afa053acbb33d64d8dc91a19 SHA-1: 70a6d0bfd0cbc16842a76359ed14f13f6b440ba4 SHA-256: 1a832e2e2d871e0f2df8e7f07ded04322223e17dad63031934248f18538f109c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The embedded JavaScript likely facilitates these malicious actions, possibly by downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/49645027962.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/e5hqk5dtiitsh7fc25e82dv5g4/vamejegisajifasilivaxav.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/32954258122.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c7986077---17875166291.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/82782336013.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/91877972861.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a566a94ff017ec0e62f27399d6aa1782/ragadawif.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948358680f0---wevakotugibobojefiso.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91b2f26300---bogukoxezikofomuroda.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/xesudizejerasubu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b2f75a41c---jibuxusaniwerujalesaxow.pdfIn PDF document text
    • http://email-database.info/userfiles/file/defopavexejisepenom.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d29a9b17a---gadejubaros.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/legawodedasalebiwimevo.pdfIn PDF document text
    • https://oferta.lt/i/File/67617657033.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc04dd7c2---wavewit.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/407f11c05d9544b357517b24124d38eb/15940944838.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf64c225a9c---runogolomikiginexu.pdfIn PDF document text
    • https://ghnservizi.com/file/25263828811.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/dokufegubiret.pdfIn PDF document text
    • https://bnovum.hu/downloads/92012560941.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/vesotiwawut.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f319b913a3e0d7d36c65ad574ac4835e/lujawox.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fe361c2cfdde7e001a2526081a26730f/difelasesamobobanef.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b84d1257a666f36e17a80eac5b6b40e7/wimupoxufovaxojimefavo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f31c33c0a4---12809592898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=1+80+cm+in+feet+and+inchesPDF link annotation
    • 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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 17784 bytes
SHA-256: 96c5149a6769df9e5006d931abd0348d6b669328bf6d8c7bb1b1a6683a805dc7
font_02_sfnt_off00012bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB7 10760 bytes
SHA-256: 7705129186a1135cc67548a5bb92efe7c625cec4d8ba0cd609ade7f4005121c2

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