Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e239dc08c7f175f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 21:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ba90d17e48359d0999841bf3803e06b SHA-1: fa373ab9c75808a695c1c794d958472853a06d4a SHA-256: 3e239dc08c7f175f4584f35fecf081b88bd4f6c52fd1e876dfca7c03493c8abd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics indicate it's designed to redirect users to potentially harmful content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1443ddb1---78609346258.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ds78t4udcehj4jd6pgjgacbif7/96581729628.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/jikesarigimudurazuxuru.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/24878981105.pdfIn PDF document text
    • http://katachizu.com/img/news/files/78470681403.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/88518756043.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/93b623d865ca3741c9d0bc570ac63330/62225902074.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c505b753548---fuzetetelufodaf.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/37205735815.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/96030199657.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0d2bd415---27803823437.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/snpghak4pdbcjapc274n29f1nc/nugavazutunari.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/97121305301.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/513bde08961022b98aaf4d2c8c9ddc0f/tepofiwubiletu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160898ea5d9a1e---mewesivitajevulunito.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085744154292---gevijufodetolodag.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/fojirivojixubukufili.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/76928443878.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e27b662a---83528168653.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/868303e1e561ec29f9d22e6393365664/3037850404.pdfIn PDF document text
    • http://promador.pl/userfiles/file/dagunapasalixewirasajibo.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/71125025225.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/86457247887.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/lewafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=termostato+fantini+cosmi+intellitherm+c31+manualePDF 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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 18296 bytes
SHA-256: d14e3f5fc81f79dadfa6a04a3cc140629876c8534f27883809e29c75425153e1
font_01_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 10888 bytes
SHA-256: 5f8d043f4e3a4a9a0b5922eae20802777c0b3e897732a7599a0fc9e5d32a24de
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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