Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf804bd60b07a43…

MALICIOUS

PDF

75.0 KB Created: 2021-09-30 22:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f0ef45bdd1aad7c8ed6397427b2b2ef5 SHA-1: 15af9c6e879e852e7ac980745406efaa745e0b92 SHA-256: cdf804bd60b07a4358e4400ea961966bfe66fe42345ce1fb54ed9bb7daa032ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://artbaget.net/admin/ckfinder/userfiles/files/94704760603.pdf In PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376fc0c98ce---tuwep.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/nawudi.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/51969489941.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s3kb3724fsv5814vtq9trmk6ok/39606259675.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/7057714729.pdfIn PDF document text
    • http://ministerium.pt/files/bixalujevamosenovelege.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/39389534500.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/netutevomiruf.pdfIn PDF document text
    • http://reopen911.info/media/file/wibafafoxibopovisuwasite.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469885100e3---28929934022.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/moxov.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71e937a73---71498374071.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210924_022652.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/kotujoxusepa.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615213e72be8f---68447051197.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/kekezisanexebodifor.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/jabokeralesikunigovat.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/tirinasepugokezedurixuf.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/68641557632.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/21590195364.pdfIn PDF document text
    • http://sung1.com/upload/files/kaxig.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/94268300725.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fopatovewili.pdfIn PDF document text
    • http://le383.com/uploads/files/60020043140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=project+android+on+pcPDF 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_off0000bd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4B 10424 bytes
SHA-256: 1bad63fdeae57af20fdfd7744f9bab43a69ada53926c10ba9291275a6ebb3bba
font_01_sfnt_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 18756 bytes
SHA-256: 5d6d6860c4309231dacfd4b3c828fa2dec62b9871dd065bf9923609a4e0f342f
font_02_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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