Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9e43a51bb61387…

MALICIOUS

PDF

78.6 KB Created: 2021-10-06 01:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 06a0264086b4b64e8b9f07c8fea5afde SHA-1: 6bdbeaa324e00cfe3e1400af3f564e772e1e3e65 SHA-256: dc9e43a51bb61387dbfaef4c2bd3d26f2f91d8a232ec329f9fa62a82b857e03a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are consistent with techniques used to redirect users to malicious content.

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 https://coretry.ru/uplcv?utm_term=dvd+player+parts+and+functions+pdf PDF link annotation
    • https://protraderin.com/userfiles/file/34589554855.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/daduz.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/siwonaxajulajewor.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/79629176020.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wurop.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/66626162147.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/fejeboke.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/58663788484.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da1621bfd22c7add26c1c375270e2f6c/24895165479.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/zibejufawutexo.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/nuxisuna.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/68912402987.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/kawutawo.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/42650000381.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ae51fa3b---jakijelakibagazegoruz.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/fenakudazukuvilomu.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/22824321617.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dfc9896c165a061eb7d12f5858340a7/kizubotogasoviwi.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///vugezugamodonatavalivot.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///kamamuremevorutus.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/gajugimugotanuruvuse.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/zibab.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/mojorugoge.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///silajesamixonisakano.pdfIn PDF document text
    • https://luminex.pl/upload/file/ponux.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_off0000ce78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE78 17188 bytes
SHA-256: 3359c27187accd1babc38a0bfd142d6e9ef7958f33f602ed613df5bb338d798d
font_01_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10892 bytes
SHA-256: 45e9b865e80a7c0b1fa8455d253caf008d9d618224dceb69d35684b4c3458db4
font_02_sfnt_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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