Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba946ec4e129638…

MALICIOUS

PDF

80.6 KB Created: 2021-10-08 08:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d93538c8c8cf47fb9ed1da9341e1834 SHA-1: 25baf1358f4480acead8ac152324f1b2ef6af38e SHA-256: 8ba946ec4e12963801eaf642202f12c990b26168810e797e4611500f6c44f63b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://max-metal.pl/gfx/file/82303396745.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/88983e1d92e3119624fe7d8e079c1b28/51547881803.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/69844254525.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/danunixope.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/nipewew.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/15643283492.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/gevijajafodolifegi.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/74249580204.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0ng3c91f7f69m4rn47iqvinv3q/sabovugagezarugokugonav.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/mosoputekazur.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/77562647051.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/bebafasan.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/tawivuwisolonujobupisas.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/muvowijori.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/50757092030.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/35989355598.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/tiwimituratobaladin.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/30184716833.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/63134061452.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109270336356129.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bd67986934---saxenoza.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/nebanawinepunigob.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/2134593321.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/g44gidve0qofnjo391i0vmc074/33892876854.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d3d26d2188---bapopum.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/53040034258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+activate+secret+conversation+in+messengerPDF 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_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 10672 bytes
SHA-256: 52de1ddc86931a58786ab6674946c1612cf27f002388aefa777fbd8aec1abfd6
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 18920 bytes
SHA-256: f933a696202c73d5ba0c7cb2dd2a426862010875281fafd1e871f03ebd24ab96
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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