Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27c380ca4307cfd…

MALICIOUS

PDF

130.5 KB Created: 2021-09-01 17:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71b3b02e30c277c8c8d24c8124299595 SHA-1: 08c732269dfe3489f3db2f33c430826e7f429eb5 SHA-256: d27c380ca4307cfd6a66f81310cef935a64e89562d02e93a1584168e9c0ef6b3
172 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute further malicious content. The presence of a 'download button' heuristic further supports the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9291aa754---11618980877.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfff9a7962---vezufodoje.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/podotoguvidubifog.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/94122552704.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/sazowivivigolaf.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/fabagedek.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/gisoropiwutojipo.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/9794727426.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160707ea565fac---22452261750.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b4f3c459e2e9b98ee27154910e406879/14641132659.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/19966068649.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210716_C28C27CC87A98CDE.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/98624029546.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ujcknhqsp1gabv8quvnpfke0qh/wolane.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/95933366399.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/70108283092.pdfIn PDF document text
    • http://hkwwta.org/userfiles/najafitaserisaza.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160afc63a5b095---mowojopikoguworedewoj.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/5965806330.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/aecdaff1f87b0ffe772db38ab99542fa/galerosamunexujulatotej.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/jexirir.pdfIn PDF document text
    • http://abpaluso.com/upload/file/rabog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=no+exit+playwrightPDF 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_off00019889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0A0 10540 bytes
SHA-256: 4d5cd5bb27f0640b2d682c80498d17290800e8af67bf2d63e9aa062fdc4cef8a
font_02_sfnt_off0001c8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8DD 19784 bytes
SHA-256: d1c2f2b36885dc1aca78bd203f8fb6d88389ca803478fec47af0920dada739fa

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