Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb429eecbee8fc95…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 02:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75076eb73d490044a89907a30e55f857 SHA-1: c3a1fc1b94c9e57744ee96ef5922c5f2b1138395 SHA-256: eb429eecbee8fc955242f3477728a8029c17c11f93f1efbd86ba45a9e3d3add7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm hosted on compromised CMS uploads and disposable domains. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://iwanbim.com/userfiles/files/tedujixobatu.pdf In PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/fikunuwobemize.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/33119688683.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/fupufokomefofa.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/502nanp7gn0sq9pchkglkjejb7/mubanuxugatukumopis.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/12818551018.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090817511573499.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5qfc0hmab5hjutimc7egh39dnj/gapewaz.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/kiledaveniwewipifop.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/jutuwezaguveroguwinawur.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/24835019168.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/67141601996.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/lubefezo.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/34360672005.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/44116910960.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/82024217063.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/wimunolamoladovow.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/gikozukimoj.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/fogewuwib.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/1545856065.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd7e084bc---difuzeziwodegajurimorarub.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/nakotimusisigagunalagow.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134542bdfa9b---tizewugumir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=printable+periodic+table+with+chargesPDF 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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 17312 bytes
SHA-256: 72b5a18c4b62e4363de041f147bfed051254b87f81f8616923c995cc4e1566a8
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 11020 bytes
SHA-256: cb0933467dfc35e97bef206611edb75cdace0fc6cf45f7dbabd71c58a5d94f7f

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