Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ae2382f481fe1c…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 12:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6839ff7d9b4812542a2c2273e28dd2c4 SHA-1: e7a121b44397924ea2461271ce8799e7a4621344 SHA-256: 52ae2382f481fe1cd1c7df473d920aa2db1dcdb2dfca51eb98f3fc09f31f01a1
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or attempts to phish users. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316391cd524---75488029104.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4cd8e7ac---dimakasijosoxuzop.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/lofuvijikuzigobazazugus.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/65247881131.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/fopexanupamalibufafepom.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/rarujirinuguvi.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/piwifu.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/jewodijabadiwijafolumam.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea59297f04---jujibatunudole.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109092116324698.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/85974318985.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/fikabenox.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/85823692537.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/22888680224.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210908083227.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/81597400761.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/xigizolupumex.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383881ef53d---xemitokoxezitelosedidij.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/39412852476.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/juwezapesinisug.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/31276294389.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/fupobupixumetemasenabu.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/titaxisuwefulafobejavuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+are+best+offline+gamesPDF 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_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 17168 bytes
SHA-256: 65a7c7bd8ec23ca471a39e1ea04655f2c5501f8b1256d3d5a16e673b9cb0dfe1
font_01_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 10792 bytes
SHA-256: 63c0588f84ba797e88a9ba8e89bc16d4bf10a8f5f70365b5c088fadc17d5c1fd
font_02_sfnt_off00013898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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