Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a39eb8f0f674e72…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 01:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88ad3ad3b56bd87ecf458cae92075a9d SHA-1: 7d3a4fc77e41f22158b523c7707b21ac9d8ae996 SHA-256: 9a39eb8f0f674e72bab343893b3f771bf44263ea30111ee640a032ec0c4b808b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. Embedded JavaScript and numerous external links, including those hosted on compromised CMS uploads and disposable domains, suggest a phishing or credential harvesting campaign. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://cructi.ru/uplcv?utm_term=the+half+of+it+full+movie+download PDF link annotation
    • http://tomdythai.com/userfiles/files/21765044823.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2039af7803d43a0d168ba107df59d640/wejefasapi.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/wefodusizikidufexisusazi.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ledezimibusixarorosavagub.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/kijuxizezipepobatuxowod.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151586c55ff8---18638946001.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/61427813739.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc47d27f0---8845614105.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/dobudunaxezu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b119f3adcd7df4e05177c0935ab1718e/16662168865.pdfIn PDF document text
    • http://kahasat.cz/data/file/99632983050.pdfIn PDF document text
    • http://ellev.fr/upload/files/laroledibekigofumujunabo.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/48056347826.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/37287748022.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/14753647873.pdfIn PDF document text
    • http://eternaseguros.net/files/files/duvewidujita.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/4949767478.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/35902865971.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/40401098165.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/lajukefugazuwaf.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/259371eb1abfafe48c612b4f1c8755ff/32003691751.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe6d0f1de---63842566589.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/16491045476.pdfIn PDF document text
    • http://sro52.ru/uploads/files/58513829922.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/49917487454.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161524ceebe9a5---dizesosuxanepaxukuluniwog.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/24971555735.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_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 10564 bytes
SHA-256: b6155d76e47d73ef521da4904739cc50e1fa22a376b315c2d27e757ce94d7f7f
font_01_sfnt_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 14916 bytes
SHA-256: e78d7c8ec6d40acfbf18d799c919f1cf0a005341f348b6997cf76b4b68c6b4fd
font_02_sfnt_off0000f594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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