Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c33966bebce7b7…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 20:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 08390555a3cc8eefcdeda37c0a3e4540 SHA-1: 3bc6e5ecd767c6488d39134fe219e48ff0c391f6 SHA-256: 84c33966bebce7b7265e23c2ea54065efd749fbcfb94cf5fd48790d4eef7882f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://lixupeng.com/uploads/files/tuvemapokidukoj.pdf In PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/lopudevowa.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/39509037014.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/sirumepokovamuler.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/74215912932.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140618a4ab97---sokijorifigoromujone.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/vunewigolupemaribibut.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/79764060331.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/83539708652.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132722567066---xuramawerama.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/zapuwijavajipulez.pdfIn PDF document text
    • http://babamoleskine.com/files/file/sigusowolupasawa.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/jujosotomoneke.pdfIn PDF document text
    • http://sdes.in/uploads/jerenodufebisugewabifu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/171255217967.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b2c69eddd---25125124016.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/fiwuminipunerepojolal.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/48129419579.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405b394b57c---26263376420.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/6097259059.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/kerosevupekulunabemapupux.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/gepojukuxelo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/24854dfb525d20439d2745a2a7b71d8e/vokubu.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58938278115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=acquire+a+charmed+veilPDF 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_off0000b06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06F 17244 bytes
SHA-256: 84ff101c017fc2de9c46bcb94197ce66abecfab53c8914135d11c8462d1b2460
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 10436 bytes
SHA-256: ce4b87bca8fc944a03d4110f80c77ba0b596dea44afbf0954f096fa60b0da3dd

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