Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c0d42c392d9ef2…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 21:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 59e692f4c7b50785eb116d7097b79d06 SHA-1: f850a7d3d1e51e212aa5ab94f6d2f38fc857dee0 SHA-256: a9c0d42c392d9ef23e68741953b70119de23a6e14d32bb9d3e5d4ec24bfffbac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to artificially inflate search rankings or distribute malicious content through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9f8660b0d01ef4622e8a397e7d038668/bitulafubagujovo.pdf In PDF document text
    • http://highendschmiede.de/highendfiles/file/dejopitexonul.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/88306584471.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf05dfbb499---wenew.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/11162562198.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/91080e2a375fdaa142ab7303194d6fcd/kewagexonewejet.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/54415168516.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/50079994162.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/pilagiweniteba.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af846281fbf---wekelokefun.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/chljk2fou142gstdo0s45n9gk7/kigifekanim.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2bffenoh2mipiofgb2f6htjm53/lojuko.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083178ded1b6---faduzesedezitudop.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16072f90794b12---55176545991.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/rabutatujutorujogit.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32f6312ea---nisaxifupeworogi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f47cbc34---taxodiferi.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/99142194552.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/997d67660f92284a3109113ba29f4717/zupimowagomafaxofog.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/50dd7308adcd581b69ab74511b54f0e0/roxedidotobonuli.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa2d048e9---rumonexerelizojuj.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/63960625286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+short+run+aggregate+supply+curve+isPDF 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_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 10896 bytes
SHA-256: 80ae895869ffad99696a67c857342a0e4e5e61727295f49230933ee4cbd23697
font_02_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 17248 bytes
SHA-256: 3c2cf31e0eec4bff352d7653110a3537c8e0ef17b3f9bc6ccda6db5c723f531a

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