Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fe28d359db2b3a…

MALICIOUS

PDF

88.6 KB Created: 2021-09-16 05:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 825d488ebbf16db440104bde9eccf988 SHA-1: c5123056b80cbe216d7e06a2ce2100d7f566a164 SHA-256: c9fe28d359db2b3a059cb5cd11b7c385e87298ad2ce4c8a71286b54944dcb774
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a fake CAPTCHA lure. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect the user to a malicious download or phishing page. The presence of embedded URLs and the overall structure indicate a likely attempt to exploit user interaction through a deceptive verification prompt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=how+to+get+a+free+nitro PDF link annotation
    • https://takarasushimn.com/userfiles/files/zemelo.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/36098050050.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/suzuwu.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/35224150205.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/banasebisorufow.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518abd23b7---43685233096.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/055f6e0deb47637e51e5537f65ba16aa/lijukutafalelefanupu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9185517a---xututo.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/sonofosogilakikeg.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/jinumobulorajen.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/menogomiruxofakawasibov.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d53897191---63504065499.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613940597f244---90437506358.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/92362711233.pdfIn PDF document text
    • https://ebooksweb.net/files/file/vexataxezuberonujunodo.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/gaxivasagutamebopaled.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/84266961793.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/kodurezibofuwizax.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/watijowusina.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/35745048238.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/88469815945.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/tafebovo.pdfIn PDF document text
    • 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_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 19616 bytes
SHA-256: b7e42e2570298baf8ad7d382cadd87cb7ec07bc5c7dce69733d2f41e62765267
font_01_sfnt_off000125c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 10252 bytes
SHA-256: 44de7f98f90b32b95d2755a4b91b22520bb1ab3c1b78a03e6a400fe92134efae

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