Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9191c8c250b57fb…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 01:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 235ec941c01cfe42849282092cf7c34e SHA-1: 53037a85f7a0688bdb7d8749a73cf20f4dd09a76 SHA-256: c9191c8c250b57fb7529edb20fb13e6ebb858ed3eb3fed2c2ec1377049c1bb6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms hosted on potentially compromised or disposable infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=install+git+flow+linux PDF link annotation
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/38947022597.pdfIn PDF document text
    • https://negaratoto.com/contents/files/93494371453.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/14528373107.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/11166647974.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4f064c78bbfb1badcf6ddac09734f10e/99017550560.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/56660256639.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/jawovevuxukez.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/de02d2ba23b46f132ecfd1f6459392f0/32693866801.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/jasekitovuf.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/zimutuxagaxipebafepixusox.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/65595065285.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mo3mat8a5pkc2belkpoi8o9jd3/56357631126.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/tebifaguruliropis.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ff02869ce06---pexinidevuxaboxi.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202108271220051062.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca86425aa5---82953256721.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eb46ed9b5---vejifofusar.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/desedefafuwubagawi.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/zusisuvugajironobudasego.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/jividoli.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/ruboz.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b4cfe9cb6f9f1da06088aacfb8992bfa/pekejozuwilapuve.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7c057ca832dcf30ef8a6e1aa33b876cb/19647958143.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/706d6603356f835dc4c74ea28686ba57/bokujiretano.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/xikuwudedazenaxowaxerudik.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_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 10396 bytes
SHA-256: f051efb1a40f66ee461c1cb80d8e5fca6e5dd6bc385ef8aef794b6ced97a5bd7
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 18056 bytes
SHA-256: 267393c168b7fb7f3dbc2b30de1b63a340fd3e4c8760d76221d39e76140d6fe8

Open this report in the interactive analyzer, or submit your own file for analysis.