Malicious PDF — malware analysis report

Static analysis result for SHA-256 110646dadb1a68cc…

MALICIOUS

PDF

92.6 KB Created: 2021-09-17 08:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abe61131bb5e1fe050bc4813bbed0ed6 SHA-1: 4ad60f81b8923e7fe684795b5f74cc697e98800e SHA-256: 110646dadb1a68cca5c219fb341329cd847f723044c569c3dac120a8e9a42688
204 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and presents a fake CAPTCHA to trick users into downloading files, aligning with phishing and client execution tactics. The sample also includes numerous links to potentially compromised or disposable hosting, suggesting a link farm used for distributing malware or facilitating phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cylinder96.ru/admin/ckfinder/userfiles/files/21809344934.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117b8a90b2---sijesululefotasat.pdfIn PDF document text
    • http://epicridesnepal.com/files/tivatobavasusewufuwovezo.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/togafavosojak.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/16952087997.pdfIn PDF document text
    • http://domplus.su/userfiles/files/najix.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/44219697413.pdfIn PDF document text
    • http://midel.me/userfiles/file/94281928401.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/97118998594.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/19130639486.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/puzopapofipufiliwadep.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/36664929165.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/28020767655.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/69417344006.pdfIn PDF document text
    • http://wych123.com/upload/files/97191180149.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xiwisi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecc04b20f---kepijarimewegoxujogew.pdfIn PDF document text
    • http://bubb.cn/up_file/file/6324402832.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161351ac02c7b7---serovewejopabovovevider.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/48660662132.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/61488285543.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/64569086808.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/ridunupewezebogew.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/fowixalunudut.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/gaxejudepivagapirojaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=beamng+drive+android+apk+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 17932 bytes
SHA-256: 9d10b32af47881e3bc7f017ec6f80b090c97488923347e1f8bd2491696a2a3a8
font_02_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 22856 bytes
SHA-256: 9d4070f810e517bb566882c9fd43ddaf6de05eb40f665002e560ec774f754a47
font_03_sfnt_off00014948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14948 10872 bytes
SHA-256: c60b17f0668e08464580598540f237bddc0faaae1af96e0d31fa9cd3a067a15e

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