Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb20402a8f7bd838…

MALICIOUS

PDF

73.1 KB Created: 2021-10-02 18:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41642f30cd486fa54de32cc1dd538b75 SHA-1: 7230058ddaf3640b76a7a63850fd72615104ea74 SHA-256: eb20402a8f7bd838dee29cb04f425f24c9023dd869b8c7bf2333f6db2f8e3c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://computer-rudolstadt.de/upload/file/57306509365.pdf In PDF document text
    • http://gardenofsound.com/userfiles/files/felotep.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/dilebep.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8a08c49fe439d99dc1ddde42da0c3595/tufutitafan.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/jeregiwojeri.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/77637805003.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/gesel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d43d583a5---78856733968.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/81297212352.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/64513845339.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/mesejasajodafalapeve.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/tixepi.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021100118452973499.pdfIn PDF document text
    • http://hingliltd.com/userfiles/20840847625.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/sokusudamedof.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/93855869120.pdfIn PDF document text
    • http://imaginove.eu/data/Files/gusodiniraji.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/89472720822.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/96426392142.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/66321184995.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e331342ec---merok.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/98501856382.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/14315197221.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/58209254448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+selected+partition+is+of+the+gpt+partition+stylePDF 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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 10976 bytes
SHA-256: 13b780be251349117f11e64a4dc46c971709ca13bae54a89a27fb24b1cd10e1e
font_01_sfnt_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 18644 bytes
SHA-256: 6fdaaebbecbb0ec652ef12785ca3a779abf62e11b97ce189b8f47a96fbf1d789
font_02_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1