Malicious PDF — malware analysis report

Static analysis result for SHA-256 804dcaa5136e902a…

MALICIOUS

PDF

83.7 KB Created: 2021-07-01 18:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c61d9d2f7e5d37a5282911b1f1118af2 SHA-1: 4fcacc751b8d83d0fc90853f1826bdd2f2520404 SHA-256: 804dcaa5136e902a26b5dc5c961a4f0c32ac3d145a417a61a2c22423f4e286b7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution vehicle. It contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=hypothermia+from+alcohol PDF link annotation
    • http://pekingtogo.com/uploads/files/muwivuxejinut.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca19ca4b1e---7094981150.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210626154704195.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/387b9147d77ef3129a2246fc5de2d690/64409664497.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a863d0cf5c---85248803299.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/bifebexidonukofa.pdfIn PDF document text
    • http://chieucoingason.vn/files/xuravegemevanunab.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/875daf07fa7380bb2df9c0f53aa73009/88534617795.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ojarp36aavb3if5t2b01020k81/godufelozogirovon.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/nojesowufulosaso.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/temebojes.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/69116392367.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/rabativiwanibid.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/99334502916.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/npaveuopv88du1ah1qlgm63m02/67999384334.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/03a0f5a6f50436a9452efcf4ad11501e/95913780948.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099c3191ddbc---xutemos.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ca696d25e---kisosewewotobebave.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/71291523338.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f4a8ee24---kosako.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6d2fa0957835180c453d063ad497f3aa/75432031981.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/b27bff0062255e3a97b7d46af0863bc0/58157780477.pdfIn PDF document text
    • http://proxima-design.cz/files/file/joxajekirovanibikomito.pdfIn PDF document text
    • 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_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 10580 bytes
SHA-256: 5d5352f297a4608f5ce9f6890127fd7ab61fd8df62c1ab6369f1ab246d681463
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 17076 bytes
SHA-256: 53d0a6ad8745e34911568bb062b7c00f6cb33bc2db8614208d96fa70996e9832
font_02_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.