Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f47948964c98d6f…

MALICIOUS

PDF

89.7 KB Created: 2021-09-22 11:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98d76b4efe29eb357a4cb2dab444f191 SHA-1: 9cb7fc34ec44bf6601815fd4deb58a14e8d860c0 SHA-256: 4f47948964c98d6fdcc682a5db9f4c7dfe6acdcfb75d1cce5072f78ff726cf35
172 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=bhagavad+gita+with+meaning+pdf PDF link annotation
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc3da3f9f---fenagusopesewexibix.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/zukidibilufalepin.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/paduseponifijanegupigov.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/36526045293.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/771297583613f74fd3c85c.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/25061115496.pdfIn PDF document text
    • http://gojjang.com/uploads/files/46156534859.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/fupaniwuxiziwepudoza.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/47483404750.pdfIn PDF document text
    • https://pt-olympus.com/contents/files/4269826524.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/vatugarutifoze.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/57905822118.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/89753265883.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/3450195211.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be755ae3c9---32307109611.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/10694295310.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zafomoxadifezofotafijos.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/netukubezobu.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/kumarorawifukaregu.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/rasajifikejotokinoz.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/82900046870.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/judeluwiz.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc7ecccd8---28408743752.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_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 17620 bytes
SHA-256: bdf3e83bd20d949eb45a0d03570189f2e751b983d970671d2468b8797aa25be8
font_02_sfnt_off00014113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14113 10716 bytes
SHA-256: c276c7d663843ab21b880e15ed6d310248e464ca56896ddff0753d116351fa2e

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