Malicious PDF — malware analysis report

Static analysis result for SHA-256 9158276d914d9a8f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 05:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12145bda563fe4767132d0fe855fe4de SHA-1: a6567ffaac4affba353df0b02072290f676d97fe SHA-256: 9158276d914d9a8fcaa116e449c970e911096844f2a473415009fc84ddba53d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, many of which are identified as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://kastely-vacduka.hu/fileok/file/1275133391.pdf In PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/37344235246.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210909062141_1216485703.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/65086013034.pdfIn PDF document text
    • http://epmachine.ru/d/files/89213714770.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/gesujidun.pdfIn PDF document text
    • https://sim2007.com/files/73760702763.pdfIn PDF document text
    • http://beiks.info/public/file/zojiwifumiferibexoni.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f2407a8f3845656cd7a2be54c2ff0ef9/59889668374.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/zepafunasume.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/86437015249.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d014a184---xosozunofili.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/11864612283.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/35426650451.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/rixafijifusi.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/lafudozogula.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/a7ugb1879cgnpc4c1ejv0bbrkm/gusebisakegajadiraborajo.pdfIn PDF document text
    • http://cocoal.com/uploads/file/80533858849.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109140811198794.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/71512856683.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/dunoviwip.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/8170932375.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5a3860de---gerubegikimilovuwijawozat.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/79880165497.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/jubefifubakesekakukejos.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/19531737877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=descargar+juegos+para+dolphin+androidPDF 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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 10928 bytes
SHA-256: 0c2f80720dade08e5a36b808aa4034d0d88822c72f9b39af8a10de2bf11bda05
font_01_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 19336 bytes
SHA-256: 0e0dc8f5eb851cf913e85b3a18db549e86c788eb4a760087d2009bdb2b1ffc3c
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1