Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ba11c9d352d9e2…

MALICIOUS

PDF

89.3 KB Created: 2021-09-16 00:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a9a6d106ed25d54af4b9a2fc9e726e11 SHA-1: 106585c77205addc9be592801cec97c55a1591ee SHA-256: b8ba11c9d352d9e296d0559bf2b5f49a1cf80c6dc1d5cff70d37e55442e85ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://edgecs.com/documents/56891562249.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b39629cde8---87796195583.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/50666360611.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/nunuxij.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/pubeda.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/40652088520.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/gaderaritusatokexukokize.pdfIn PDF document text
    • https://durimawar.com/contents/files/9037125713.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/14546148274.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c7529d32---xixoxexofab.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qkqj739rdj563kjhq5in3p4hfo/11953044511.pdfIn PDF document text
    • http://flomojapan.com/upload/files/21150937968.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/20584992116.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/58167591963.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xegikopufulagoba.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/29194340957.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/88445490954.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/84646744174.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/12519903915.pdfIn PDF document text
    • https://umutfm.com/resimler/files/2090128625.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/sn8jhir5l9p56gb690chc6fkab/77323457231.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/82cb397cf42841c25a6962ffc0ca6534/lasinamowulirunot.pdfIn PDF document text
    • https://nistd.in/userfiles/file/xigufepororozukudogu.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/modujupegorogusigoxeror.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/86674158730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+set+default+keyboard+in+androidPDF 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_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 17884 bytes
SHA-256: 2b2b1ae03d3f21bd592c6a1a997e64bf7b44ca74f709e3c1defaf2c0c86b0894
font_01_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 10868 bytes
SHA-256: 6726f7f7151552eed65510a834a0cfcb62e337d24383d9144912714080cda8b8
font_02_sfnt_off00013ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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