Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bab991312dbb2d6…

MALICIOUS

PDF

89.9 KB Created: 2021-06-27 12:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 764fc8dbec51e3ac61d51e4555ee3814 SHA-1: 4aa6a0cc64487277b7ded623a8dbd8f25ea7e230 SHA-256: 5bab991312dbb2d6950be49512d1156b896dde97507f4ae40734e36942a5f8c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=does+neutering+a+dog+help+with+dominance PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6cce14ac81cf78ae79f38512c35804ba/64720876905.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/40809982437.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f69fbd874---42040907658.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce39be720---7583780417.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5227cc504b---91872651557.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e7b3dc39ef9663070dc70cf08c2ae4db/junetewanidotit.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/juwowazo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5437ea2878c3cc4ecbb5185fac4c7066/miwudinoweninopikejawadi.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ajsomrse1929q68mqsd5g3o7up/fobemazase.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9cc9e4033501b19eccd26af450097d7/4422852525.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/vedafivezinomebusenunojit.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cf1fe5cb24c10c1bb7bcb0d7bb79adc1/44926869222.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5694973fb4---romiwawedikisa.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/94077918887.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ebmvdmet4ir3apd9q6j02ukhqj/31738691037.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f876573312---wilojisorosu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2bfe0a43d---dugakeravupe.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d6591b56eb98e4c6f26369e0283b674f/bubipesiku.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c4bbe01cc278f589f6a88e0e9e0683c6/lilulazuv.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0a23fab375c9796c4a96a7a9a76124eb/23387246651.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dfad20g0fme8bq2qe9bnrba7kb/najevagajifakok.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/resipotorojiropesudefov.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ca969eca---22681799957.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16085840f6f5fb---ronilejonumibogeb.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/c2stlgqb4379h0g1iqrekf8l25/97005128139.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/36445662345.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 11148 bytes
SHA-256: 443ab7e0593b813b744b2f0ea3581534e19a3d31ae1ca6ef640587b6a85d1dc6
font_01_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 17108 bytes
SHA-256: 2cfe7218c689c624151a3e65434cf6085d15f3f9525e723a6278e7e7b0f2e1e9
font_02_sfnt_off00014039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1