Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7df9308221e2b5…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 03:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fbffc3571f2108780f1dbd99d4ef58a1 SHA-1: 6b2ec67713700ce5b6aa35c8b13d8fa8b00f806f SHA-256: ef7df9308221e2b5f2380c3441d03fe1519bbf280e4d37597026c87e591d2153
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple URLs, some of which are hosted on compromised WordPress sites. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3f296d868e8bcb8b9c6a4c175adb0817/82219335887.pdf In PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507134837116.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/5ovs5bu4uql53ju8m54t69s736/duzoropujif.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210629_010657.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t4satev3ovr28b4and4c223u35/11882855091.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/830fb8f7d947282afc6aa4c877dad01b/64901550286.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/74393768410.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/80299351042.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608941f957ca2---nuwugakukisunofejabix.pdfIn PDF document text
    • https://papiratisk.cz/soubory/84953093201.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/difemofotoru.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a42bcf7174117205ef9a72cf191138cc/83223225089.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e087a1a09---42719590220.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/td05i62c97cal9pkhgs6qicke6/pesoritafinagof.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4e0b65334a1fd7e0a3dca843f36d1734/gebixojikusejikeripuwig.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/68296558904.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba607ea43ee---kolofagenajevelomu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d1546775---6319052076.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/19995934243.pdfIn PDF document text
    • http://ccsl.asia/files/85293654031.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106290838436351.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/67165120592.pdfIn PDF document text
    • https://electroagro.es/pub/files/molibezizix.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7a9b9b6a15f2ce73e86ddc148c22795f/1970144341.pdfIn PDF document text
    • http://szwygs.com/upload/dedowodukimiragetude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=icd+10+code+for+medically+refractory+epilepsyPDF 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_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 16268 bytes
SHA-256: eecda24aa4f5093b7aa3b7f1e3ad4db06023388028f1af1dbcc3c63162e06700
font_02_sfnt_off00012e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E28 10916 bytes
SHA-256: 48029081943fadb65f7b95537fa1daf99ee3ad4869729f2b6898eb472714f8a2