Malicious PDF — malware analysis report

Static analysis result for SHA-256 81eee7b569ca19e3…

MALICIOUS

PDF

93.6 KB Created: 2021-06-25 17:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4e977f1f60bde89e80fc866a61d50b33 SHA-1: 464dfbf63fa35db2daf41bda1ce29a3bdb7b934e SHA-256: 81eee7b569ca19e39c559967106e4dd14d10c08f2ba4ad4167b25ff7b096eeab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://drafthe.ru/uplcv?utm_term=barefoot+running+step+by+step+pdf PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0654d9b1a---30254842149.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9fea35634---zotasejij.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5f32860b---91115217067.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ed2442544ee8f38917b07c69e9664c2d/23684153148.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/fitadivodudadopepixi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0fe0dc9a---59322505564.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160945d1cd349c---46562752345.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/89025666094.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/7sv7ktik5efeq00hvrlv8it812/penaguwolakawe.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/c6a737j705o9qi6r0qccbs2p5v/33560432731.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db2dfe1ab0---rarawogojozofobilapo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6525f8c531ea5d6617593976734c49eb/nizuxigarizofa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8855736ef0---32071830913.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2cad2531---tuxirumewito.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210517045341.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff76c0691---voxagimozarikufubalew.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1f639d91d888c746168776e9f6b265f6/jasajufijosogetaburizul.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0595e3aad---benesim.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cceb9b85e---32598939286.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/85432094174.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4db4cdd8---8720323169.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/18363421685.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/bukilabak.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/26483509072.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 17680 bytes
SHA-256: b96822dca57124ed048ba7753572fda14ec2feb686ecded314fe75211c4244ec
font_01_sfnt_off00012601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12601 11036 bytes
SHA-256: bb59bc04decba4b0b9fe34c12ed33f8eb3bc0ca734407720db11be11747f7567
font_02_sfnt_off00013f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6B 4596 bytes
SHA-256: 13cf8e916a8087354149c9510dc2963bf30c0ec456a78804ab107c9dac2f96da
font_03_sfnt_off00015048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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