Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa39d4af04a14144…

MALICIOUS

PDF

86.3 KB Created: 2021-08-10 16:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8fc276aa2aace36b5c2dd95df8372e8 SHA-1: 7a2ec35bcd5dabb745b094a902650e50f8009490 SHA-256: fa39d4af04a14144fb56a2dae37ed8b17cd3a0ff2266465f14118608eba3d905
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the 'SE_CALLBACK_LURE' heuristic suggest the document's purpose is to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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.
  • 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://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/86678765055.pdf In PDF document text
    • http://talani.nl/userfiles/image/file/sinisiretixovebolajusirox.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/pimotoravewu.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/90824330441.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9476647103.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/17107839946.pdfIn PDF document text
    • http://sushibelovo.ru/files/newafuxolulugimalilador.pdfIn PDF document text
    • http://climtech.com/files/files/16855793464.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/56f2cecd7c8e6cf3e1585d5520883800/75389156735.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2b80e18e46faca68cc4d2a3f1f4bbd2f/siwin.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/73fe0d09aa3b6078ac274ec201b284c7/fepekofasoboped.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085a21561896---10559401835.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/kovam.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/99939489618.pdfIn PDF document text
    • http://silver1979.com/upload/file/13472697859.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c92884d226ac824a4c658526112a9e5e/vixawekeposefipoxi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609738cfcc801---tunuwukavaperedow.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e15149f817cce0df1a6a4a4a758a3756/61816752292.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/nixivosuzujulipu.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/46614002293.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/6827413947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+difference+between+de9+and+de9cPDF 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_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16996 bytes
SHA-256: 511f6f78f4c85b8923b0982ef614e3cd53b95f345228a8e168f93651f390e5c9
font_01_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 10792 bytes
SHA-256: 243ea6f83c03baa70c132edade5318f5f4d3e2204e26f660e52defbfb802b3bf
font_02_sfnt_off00013149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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