Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a12d69d2eb97754…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 13:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0f89525d03bad7b4f68368f65c80572 SHA-1: b3716c1bfe22c7854aed2cba7990ca4512a36fe9 SHA-256: 5a12d69d2eb97754782857391024a7a1175d4a2e66990484f4bbad6b5e119112
176 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. It contains numerous embedded URIs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=powerdirector+apk+2021 PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613587982832f---remapod.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/rorabolaponajijalejim.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riremokuman.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130972d7f80d---87698031750.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e86252a8c---73361667187.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c4401aadbe16d337bfb0e2ba5f39561a/jaxobav.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/65679322552.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/50405572275.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/waganatumorazezikunasadu.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/panagawunajezanowewunukik.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/suratalikifitowinu.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/pezava.pdfPDF link annotation
    • https://jnnjhansi.com/userfiles/file/tubokezesepitogodajima.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zumokanovurujurozezigupif.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/68013245410.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/58342164618.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/xaligelewuvumusifi.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109050802161018.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae77d210a---30578311251.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/wotetazufikavif.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o3i0ot84v6fgbso5qrhupet0s7/bulanurutuvisanev.pdfIn PDF document text
    • https://novitas.ro/files/79851378354.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/wubenilogoza.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/divaxologovolijigijaresox.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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 17716 bytes
SHA-256: 104b955ffc93bddeb59ddcde5601db72c253e85deb9770b2bc1fcec2b1f394f4
font_01_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 10660 bytes
SHA-256: 57d6f99aabe8f6f0de2a82ef5e249ed61558419227b8225fe8e048aa9bc36516

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