Malicious PDF — malware analysis report

Static analysis result for SHA-256 500047c6eb1738e6…

MALICIOUS

PDF

103.8 KB Created: 2021-09-07 01:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2a62d2b8aeb12b74911a0ecb553f573 SHA-1: 5c10366d1de77ed08fd1482a2a6e04e6bd5e51fd SHA-256: 500047c6eb1738e63f66efeeda4ff8b6f451c2acabe911ad6362fd00b829bf8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://leoclubmarsala.it/userfiles/files/xejan.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f961d46ef863cd606ddb63113a86561d/xonozawevovuganezewifitun.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612943a057581---pitidilodepuvugekaw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0fa80e30---bapugis.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/28337934618.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161014026cbca2---dozapenuwa.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/668d21aed716a8aa500985be431eb246/jiteza.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075408315eb0---66942858772.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/30b9e2351e96f237b337c246bb756a1e/rufivewadomupunap.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820cf5dd257---361599855.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/talafigaluv.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612355a35afa4---nenituzofuserarumugav.pdfIn PDF document text
    • http://markone-tools.com/upload/files/14686836726.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160724f0e52425---66516295697.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210905113545.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e69eef9c1---dumuputuzuwojijoza.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084702db8dba---saxoget.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/78489911533.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/koridub.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/88271140616.pdfIn PDF document text
    • https://udruga-invalida.hr/files/pelajisogerijasujemog.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d6f6c5575---tuweb.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/17031490479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pearson+exploring+science+7+pdfPDF 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_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D0 19672 bytes
SHA-256: dc50069a49f36034bc811580e8ce3a905b8607ba607e1f91ac27d5c0ffd0077a
font_02_sfnt_off0001785f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1785F 10852 bytes
SHA-256: b997468c37e180a604395009c7ab0258105d5360fe047970bb3f61ca451a9fa8

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