Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4406eaef41e768…

MALICIOUS

PDF

85.2 KB Created: 2021-08-10 23:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0128706f1405966b4c249d5ba6b014b6 SHA-1: ef6308dc1abb4d94971335f7a5382ec10adae7dc SHA-256: 9d4406eaef41e768004fe19865827dec35721e7a849b472cf2e5ef58604b997b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The sample's structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://agroanaliz.by/upload/editor/files/dumokuvug.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef2546427---47469853964.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee714d5a2---sopezogowiwosudabapip.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073a21fe153d---zoripoxivilanenopoponami.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0b4e1de5---15966074514.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lirigeregefa.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1e9dc06ac---bojolofadofeseriwuwimix.pdfIn PDF document text
    • http://huntland.hu/upload/file/lixegex.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/99932305376.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/kokifo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/61178988545.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/56775609490.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608255e035b05---12993687840.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/227dee1b96cb73b6895e15acb93312da/pogobogezov.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/45857043058.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/51n9805krjh3sb9gj3f6bcrdrj/36102984546.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/47381466941.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/nawovevetivutitukab.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/22066294508.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///77389948995.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/70046728321.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b95f39601a---juletuxixoxizitifexa.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860df251af4---fetim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=car+liability+release+form+templatePDF link annotation
    • 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_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 10700 bytes
SHA-256: 7bca704a42473644d8e48b6925610f1495cc4d401ee021b9f0593989f29e591f
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 16692 bytes
SHA-256: 1df8d94a97f1379cacc3a56e12315fd34824a2c08bd3e26b640df99151431ac5

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