Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4c86884943ff59…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 06:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e92f9e042a6c9f7902323edf212a35d6 SHA-1: c35015a7e0193e038fbc93911c7bcd670a509d59 SHA-256: 8b4c86884943ff591b69e872063b848f542c3dd4af23aaf98b80da6ca8a4e72d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

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 http://iccjsc.com/images/uploads/files/kivawutefilobo.pdf In PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/24184604679.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/87554492697.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/misetexexefugivoxudibadod.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/61447595880.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jorisowoga.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/sokekaborekekeza.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/kulirokigazetasiput.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/39813222597.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/91337889092.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/fumekorotu.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/10013427306.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0acfe1d74ff865ac1c3d93d8f74b2fdb/5324895276.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/zogepi.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/pukiraxukozidopegolafobe.pdfIn PDF document text
    • https://jagominum.com/contents/files/62945409652.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zozijebewuduzokej.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/41041993533.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/85786634024.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc30aed6f---jedogiminepobe.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/63253222987.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nu983qallfqsn07c7rmann56ro/kukudafe.pdfIn PDF document text
    • https://mauspro.net/upload/files/10019322009.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/bebasovemivuniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fortnite+mobile+redmi+note+9PDF 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_off0000b725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB725 17480 bytes
SHA-256: f76eeb313022d628e71179a33c93cb0ffef02cd2505de1063a9a3ea1f27893ab
font_01_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 10364 bytes
SHA-256: 1ce5005e31c5db1e7866d1ffc7e0c90b7d16fa505962307c00f3b01dacf82a23
font_02_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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