Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c411c54edb84d1d…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 15:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cb83685b6d6bc2e896c64d537c00109b SHA-1: f3cba04bcc5959e073a065b690d0e9f5ec0626d1 SHA-256: 6c411c54edb84d1d36dbc75fb612fd514b507bfef36ba47c6204ff099f1fe987
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous potentially compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aodaiminhhanh.com/app/webroot/uploads/files/19110228978.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/danusiwadugilaxuvenalarib.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kimitazajutubaxuxaw.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/sexowijovirebejasonaliki.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/ruvan.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84a60062a---21198042078.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e5b296da---16749165721.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/13286888169.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/rozezo.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/76923380490.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/wuvemulet.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/g28srfs9lt1vhujitvd571o42l/kifokuzopinedexiwur.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f068ceeeed---77792235201.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4t7sjivd6bnt6q7jaa1c252q12/95644290358.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vu26cu6hsoki615ka1s2s2aejr/merodixefetuxal.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/45366952879.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1p7hgid8v0i120al0ftle2dvm2/vuxubaxakedunuxezewuluw.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6ed72bf6ebd117b9487232e5f30e3013/88374066267.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wamiwuz.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/42397235128.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/41740514853.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/29797298601.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c09aa61d---duxepipipapopemupekif.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/1ccf9ff74cb8f09834230569811a8fc4/62525231861.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb78dac3c5---97652744204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=skate+how+to+manualPDF 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_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 10368 bytes
SHA-256: 0cdeeb8119440a1fff80939ba36b57e874c6105c71165ac838f1865c1b60d2d5
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 16948 bytes
SHA-256: ad3ebf2960b2d37e201f64abcc31f4980c2288f0903029e69d290d7e1428d4fb