Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecca900261939b0b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 18:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f806583552c42afb9b8e2cf54a4688be SHA-1: c554b87a9e0f5591d7b74e55b34e69482242a1fe SHA-256: ecca900261939b0b1c91b8a5dd7e61da5f7e1b318cf1c137b111dd26b708012f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to potentially malicious PDF files hosted on compromised WordPress sites and other disposable domains. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, aiming to trick users into interacting with the document. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://kleinschaden.expert/userfiles/file/87818424733.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5a2af3af25a5c06aa0520757b8550040/22818608999.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/44481000900.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e36aed8a4---75274068676.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/68905141439.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/62915220191.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/kemokodenun.pdfIn PDF document text
    • http://samtekelektrik.com/files/94012054956.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/nipuxesex.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/kabexalemupiwakapetinap.pdfIn PDF document text
    • http://palami.by/images/file/41388423476.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/50396024906.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/706619844.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/81324436244.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905165131.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/pezuru.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/31178558545.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161404679bc07f---zomipapu.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/90166858363.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/jezozumiviwexis.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28196426543.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161315b2fa40f1---63045571451.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/mamaxikupevetig.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/63031514763.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/33974014863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=export+contacts+from+iphone+to+androidPDF 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_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 10924 bytes
SHA-256: 1f53f81081d00bcca97839e248950ac5f1e6c96fb2fb0b9fb923ace41f4ed591
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 18192 bytes
SHA-256: de473281ed3b1e02141b8e74e4bf8a956b8b21d5ca1249fc71c589817b4d3f1f

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