Malicious PDF — malware analysis report

Static analysis result for SHA-256 239722c5014ddf8a…

MALICIOUS

PDF

103.3 KB Created: 2021-06-25 20:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef804e4f2c789e28ac4668e2f28950a7 SHA-1: 2f06a6ed758588b9590484e1bb6b6a6069458401 SHA-256: 239722c5014ddf8ad09e508c1e6c2ffb906237c7ae8205495c227e20d7cf87f1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8087c946c1---49460516539.pdf In PDF document text
    • http://softwarefactory.nl/images/file/28517542822.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/38qvr1ndslnc9f3du5lljq8a97/40620850126.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f699f4f451---gigudejorup.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/japefo.pdfIn PDF document text
    • https://primer-spb.ru/files/files/durekamelefab.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/rokovijot.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/kuwutejerobifefexat.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/8775662920.pdfIn PDF document text
    • https://superchills.com/userfiles/file/25105653294.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/13210015857.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a608b441538---69338112564.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609498072a1f4---mujuxadinofimewikuwefudak.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160704a94f3cc4---wagisodipimafojaviraz.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/8479883912.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d571f7381fdf1ac80ca3ed879193dd8/80784321534.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/6085490582.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c3a91fb5---nibatodeg.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f0b33abf8ab64132706aa9c9f394290a/20900319165.pdfIn PDF document text
    • https://menu2uplus.com/images/file/73726309616.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/dfcf60a5676ff66cbf4a5d701af58267/piwikus.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/53803709703.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160865174b0d95---71251689560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=omron+m7+instruction+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_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 10432 bytes
SHA-256: 505ffc5630da9eb11a477648a8045f6753a461c2be0c844e129252401ead6b6c
font_01_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 30176 bytes
SHA-256: b8884130484e1915095359e8dcbfc2f2ca9c27cb88363d85f80dcc6d17ddd937
font_02_sfnt_off00017650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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