Malicious PDF — malware analysis report

Static analysis result for SHA-256 9824560f2b6e119f…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 01:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 73085e6921090db418fbed1e09eed45d SHA-1: 88c7b315e117ac0ce1c553557f1d368024ee9315 SHA-256: 9824560f2b6e119f6c09ebff1d8ee16ee983cfc04da0cd1f998275de63e5ff8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=out+of+the+woods+idiom PDF link annotation
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/76070ef0cb42ec81587477f1492a499a/29051566221.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dae2a11876bdcc8d618e6d592bd53888/wejafavamilaxi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/edfaabd4063bbc3667053d0921645b7c/93834685152.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607812254511c---22862603325.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64f45e0c9---telagutasikedifosek.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c55dafd319482ca01a8432a360a60802/towubodiben.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d74fc774a9a15d818ac1d271c52df257/gekiremuvozifulanugi.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8e692bb4---83084667640.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0c590520ab0eb0249ea51e5ea6bff9fc/maxadidezafifojofab.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/83b36ec34c87743ebc5aaa1ea3d7b26c/xelemaravixiwida.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83284caa04---kagufoleset.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/2b7392aa08103f3622e9c8cd09a323f2/sufigokivosefigedarijek.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/79526661447.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b41a02131---sujekenu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/16763009.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c920131d---75471779504.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d9e1d1b0---zemififeniwanabiterad.pdfIn PDF document text
    • http://meta-min.com/files/9540560059.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/4t9iqirv4a404tdojvc7ubp1u5/93933062453.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6784d1beb3740278b773319d77c17210/nununejadexedixorelenojal.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0ba1971d---sudatarevuje.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/noxeriz.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/88578593947.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7u46u8lq649v4v5fapk7evh2hu/xedazaxe.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/30392757732.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_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 10420 bytes
SHA-256: 1336684c6f9a9e8e8a14479e78d90cbcd6adfc2f931cef68bd034695ea9a37b7
font_02_sfnt_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 16664 bytes
SHA-256: e55d5bf5e0dc97d3bd3ad4df7dc7198aab9205459a1a4fec152dbf71322bc025

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