Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9c1da49680a086…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 00:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1373cc8799f4eba7357562a4513de8a0 SHA-1: 8cfc21780e2a8be240c1ce7eb57c747d08cd171a SHA-256: 1a9c1da49680a0861c5f213d2523149b5e9cff76dc9b7c5883deaf68ee24fdce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://chcial.ru/uplcv?utm_term=chartered+financial+analyst+syllabus+pdf PDF link annotation
    • https://armagedonspedycja.pl/files/file/72898742126.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nidabenoxofewawufak.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/26/rivotefududox.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/90683239879.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/52209051095.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/2606832537.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/batenasefirolilopopukida.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/lubogumaj.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/49704245238.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985105b19b2---95620450909.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/34108233965.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/tuwikunorofaliroxag.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/72550370289.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/zijokonamapososi.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/88000046827.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3e6e1cbb3e4d2329f0b6da108d3803d5/zetifowozemefamu.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/wofumegasokeko.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/95496658269.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b6371ec8628---kebudabubulekusaw.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/gelapo.pdfIn PDF document text
    • http://primaneighbors.com/userimages/21542629307.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/69493883865.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106442921820---20252706439.pdfIn PDF document text
    • http://evola.it/userfiles/files/23626232105.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tfh8uqam9ah1bh540u0naj2a30/pesoparasup.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_off0000bea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 10980 bytes
SHA-256: 7f7ab08f7c6331ebe411b81c66e2bb1df4a523eeae1f18ef1ed24972b45c8801
font_02_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 17592 bytes
SHA-256: 1d5265f89d6eb168bd5d712f2124d845ece583400732773f77ec51f57f489f95

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