Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d508c7fcb8ce78…

MALICIOUS

PDF

82.8 KB Created: 2021-06-25 22:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bdbbb20026d0ef48e00a90db7a81e85 SHA-1: a92de15399bf08ef980788cfbd9d222ea94e30b6 SHA-256: c9d508c7fcb8ce786684fd54e5bf42441f9451d12cce869d2b1d678d981511a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely involving JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/figmm4eh9m8no6go8tulefe5e0/vozelabuwipowezoxa.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbaf4ca16---16282867803.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11151ea22---19576452691.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/bb938d00dda909973ab557931e01342b/legesoxapomenarutovobubu.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/56549568752.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096229b6f05b---bisakaravo.pdfIn PDF document text
    • http://fittbike.hu/files/file/22745070769.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a535435c47---bifejolefazedazasi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087df0636e85---85561489978.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/80783621574.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/foxokow.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d07c1c9cd---11520756587.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/2uf6fs0i1e6jaa4lcfdl5c5j2v/tadinitigiru.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c832b50b---1720011977.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/704bcaf1700c641dbefbbe960cf5b50f/97453973835.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5a6ad5f5---lewujixazazalematazi.pdfIn PDF document text
    • http://prestopc.it/upload/file/fenewerexokezap.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/12b5dc97bfd87e8bf80beebb2a345b7a/zukenukijopukuf.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089334887715---nejir.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2ca1e3c20719de3242f0884ce5f84fd6/pagevosuzinivebaboka.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/4b2a53423ef3caec9344e3d22ca7930b/rivubasamedubewanowo.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202156456538143.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/nfk4o8kti897l20mlenrt9nl8v/loxaxusuninasujepumibu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36a45299d---19413747311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=city+council+meeting+tonightPDF 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_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 17400 bytes
SHA-256: 810cda63e8fc5dd5356d6939a19c01b5bd6e5fa1ddb188e9c3d998f8076fdabf
font_01_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 10492 bytes
SHA-256: f780de196b8c0cbea448eaf26f95761855b6b678aa075ecc42b7a70a0e853df1

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