Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdff337e658ef923…

MALICIOUS

PDF

80.6 KB Created: 2021-07-26 01:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df78c9d0e32cc04c67a6efdaa1372d9e SHA-1: 705038b8e2f1feceb3f00fae2d8aadbe8a08ff5f SHA-256: bdff337e658ef92376a79d971d28f9da1269e818180007a3a16e5fda00cf1715
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and a link farm pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://amirafouad.com/uploaded_files/file/39378945745.pdf In PDF document text
    • https://iva-vietnam.com/userfiles/file/vadokaretumimoten.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/48992709151.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/rijutebizabumawofug.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fac72834d7---fikoxudid.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/6913149660.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c14babcee---42452849972.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/h88urtk8fbf8mbj28maq7bplgq/nopokiposimawa.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/jogifuvekotolapuxinelefi.pdfIn PDF document text
    • https://bagstyle.uz/images/file/kabazoz.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608156efc5211---nozefiwawuruxotaxulaxife.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/35420542311.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/8440409726.pdfIn PDF document text
    • http://crm333.com/documentos/file/dopojo.pdfIn PDF document text
    • http://sun-tes.ru/files/file/6893007431.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/77286109395.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/03f093eb33832414497b1358304c95e4/jubiduzes.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/20485885254.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/95637195282.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc06a526546---bupemed.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/navitu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce39a8241---selorubemajodawar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=exercices+adverbes+cm2+imprimerPDF 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_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 18480 bytes
SHA-256: f8b2d9732dadf5e766e50bfa710cb2e62f4788900eecc6d0c0936f4d58f3e7fc
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 10720 bytes
SHA-256: 5879944284c698b8cf6cc7689cfe017ebe67e75880e14fa3278b13f5361357bb
font_02_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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