Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09927dcf01d0900…

MALICIOUS

PDF

78.5 KB Created: 2021-08-11 05:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: d89754d3e14e342d6e4a14cac8bf75c6 SHA-1: 0fc51aabee1d68d453d2ef074a0a46b00e9fd34f SHA-256: a09927dcf01d090024c74a907dfdb394ba670509e53aefff43cabe42f477e655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://queure.ru/uplcv?utm_term=libro+la+biblia+del+culturismo+natural+pdf+gratis PDF link annotation
    • http://creativeindustries.ru/uploads/userfiles/file/2032561241.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/dgr6rscinotko0p28ro6cn61um/98404348941.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/omrt9o5u86kkbm2bdk23h927a4/duxitoneravati.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/7e6eb55ff584fd1facf23d5bcc2c4322/91711485204.pdfIn PDF document text
    • https://hoongnau.com/upload/files/86318075867.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/37525574878.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/74074638950.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/abd0148edae34b7df55029dbe5fd55a6/lizemupomogatuzuri.pdfIn PDF document text
    • http://simonide.org/userfiles/file/duganexunafezapafixore.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/xuzividawesaji.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/268ef2faa07c00563d4875ea7444c8e4/49891799857.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d50a668c14a---fetidibuke.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8ea2d9575ae58e638c172c7a1edae0ea/75396418072.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af7bbfab1a2---17173414064.pdfIn PDF document text
    • https://peterdegendt.be/file/42979189765.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/56ec8dt76ktvf1vatkeb1bnt6u/86411897118.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/cd1a76474e1768324beac0dc2c90335f/nujilulijixomebojiro.pdfIn PDF document text
    • http://evola.it/userfiles/files/nivakomifavijofirefugu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607735a6e9b36---nikejep.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/21749240423.pdfIn PDF document text
    • http://absigorta.come/file/bopoleniwe.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/86613386786.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_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 11160 bytes
SHA-256: 6fedf9f6aab8deb68642ea2240c98e44c99175a5083fbc38471b1c5af17f8a6e
font_01_sfnt_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 18068 bytes
SHA-256: b18d8cc69c17848e5f4030b56faa915f445b23fc1f4d3b20126219665a7d2f5d
font_02_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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