Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6a6fb8e87ef8fc…

MALICIOUS

PDF

101.4 KB Created: 2021-08-05 00:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a192c3e59b04041c7b5103d515ecd85 SHA-1: 21726e7543c4a81387e6e585576a6632e4c50e08 SHA-256: 5b6a6fb8e87ef8fcfb5420d73bfa8d4e4362173eee7bbf89eb2ab072d28b1fad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cd043b25d3e2733d400ee1c355fa6f04/gisivipuruzotepifiz.pdf In PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/rovulesojirineb.pdfIn PDF document text
    • http://sivam.pl/files/file/28083333944.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///romorow.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/28fe2eb474e9b606392de78061ccff50/dapuzaforiluditiv.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4cc80336d76c7c08b7ca5d30dea56601/3421627965.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97fe0d9f2---suxufiwaludonosapav.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae719b38dcb---tinusifozerokubapebima.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gojt5g5k4fki3mmmqugsfaba17/palazumara.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/36bb674fea0b708db33a6f260b4e0cce/nabibake.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8fe03ad734c4b3a9ce7da1fdf0375a0c/lagigivipuzo.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/keseziwutijukumokupamewen.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8989bd59---somakunedebil.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ee384ad6---masowol.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/sccsdgtvt87vigdp0chmg3nie6/nukibakodojazuv.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/41275693056.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/tesafejuwuridazixuzipox.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/94712ceac9c55391281bb2103de195f6/bisevaga.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc88b41e7---54452404302.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/80816712430.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ebrqsuuq7oeehkoarj10mis7b4/65630792871.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/libobotipanamilebulobox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=libro+de+joe+dispenza+becoming+supernatural+en+espa%C3%B1olPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 20760 bytes
SHA-256: e3f13f9d6338baa6096be454f82cdada948b46769f140c002860050bef6e36ed
font_01_sfnt_off00013d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15592 11452 bytes
SHA-256: e962f0a85cad6e6725a9b6951f8a9ad4832ecbcdbfc06c7a417e522a8c9a6974
font_03_sfnt_off00016fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FED 16436 bytes
SHA-256: c37178892c861234b5c43daa3867ea72067c18b8f03b9054c919e3ea65bc529a

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