Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b523ae429b4a63…

MALICIOUS

PDF

87.7 KB Created: 2021-09-21 03:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f27986ebdff8004174659ee21d87f947 SHA-1: 08485875c93cce0a97bb55eb2d532c390c1c5045 SHA-256: c3b523ae429b4a63af1c4924339905d267c76debd9e17b0417bada4a203959bb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are hosted on disposable or compromised platforms, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs point to a common tactic of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gonguyenkhoi.vn/upload/files/7348962739.pdf In PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/35488788576.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/wisexavaf.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e0d123ed8---98311294377.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/zijipawaf.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c296c0e4d4b20491d262c574749b2e29/rafotabofanodub.pdfIn PDF document text
    • https://mcsfood.com/images/file/pikanumubonaz.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/nodirenefuruvapegib.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/tunusakubukedekotaveg.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/53281098384.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/13693872897.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210914192541.pdfIn PDF document text
    • https://airbays.com/userfiles/file/naxepodu.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/11166001343.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/tubituzotetunesetujedabi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161491f4fa5f47---lutezipapedufelazeda.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/92216045348.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/velifasip.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/nigazi.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/10474263139.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/giniwafufawudabelamuraguf.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/3763799988.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/rijovazagipabatozejoz.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/sifobukugujotodopim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+purple+mixed+with+redPDF 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_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 10712 bytes
SHA-256: 1b13d7c3c1af95ccb3acfdf22a8b907de2ba941a66334901c9dda66d73de83e3
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 18336 bytes
SHA-256: 773e5e44ce3fd44b5a49c80627e5e20d4bd16f945acfd9a8b70ff480f3da46a3
font_02_sfnt_off000138f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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