Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1c47e9ae3377af…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 18:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e06f1d1e47af0dc4711dd6dfcb31631 SHA-1: eabe0031f9c935dc8be733cf292fa9a7824361e1 SHA-256: 6e1c47e9ae3377af259f2c0e59acaa5f8662545298800dfcb90c611979887071
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://didaconcept.com/admin/fckeditor/file/xukazilerowuwefolitekow.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bb5974b09---megalujijemamokavi.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/990s6k8peh7sjb86bv9k5pb2j2/36412210020.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/jitifibi.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/mejetinuduka.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612961a152e40---didasojus.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/nokenenopumovamanobifos.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e43d7dea---59032626617.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5dec198e6---66445945214.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdde071ee16---39947764914.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d3e5f41109a3a686b1edc7ab17f663ea/xosuzupiv.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/gokevivofizuratomemoban.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/naramaresotigakodigure.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/jfneqlt14f6leom4ut5puh9hr8/folakatetidis.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e4504ff6a2c301497af8dc08abd4c752/69496635406.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/73254331480.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/53084896691.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-23/20210623103818239508.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/temubi.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/tadelilasinimapusekewepe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qvac7o9qur6pbvihmthp9qe8p5/44912845886.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160966cd4bb19c---55488548718.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1ec6ffa8---39666842886.pdfIn PDF document text
    • http://osayit.com/images/file/92943782158.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/60410137208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bosch+automotive+electrics+and+automotive+electronics+systems+and+components+pdfPDF 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_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 19460 bytes
SHA-256: 9ab2b4cb1fa73f247ce564c765f113da1a85c1e1c64336349c2cc35d9375d4a0
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 11216 bytes
SHA-256: f87f161d377cc76e019173e2ba7fd935240999cef3c7957ebde8763c4f827a0f
font_02_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1