Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ee17f76175f2fa…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 02:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 590265c59df2d34a8f496a5d7846eeba SHA-1: 140f6d927302e6de080506e605053c11fec95b8c SHA-256: b5ee17f76175f2fac89fbc665411c86edef7cd6f61521cf5d89e1207c9ca8855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://huntic.ru/uplcv?utm_term=roams+book+pdf PDF link annotation
    • http://noospc.ru/SITE/files/editor/file/4257319874.pdfIn PDF document text
    • http://salkim.com/userfiles/file/97647753107.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e7f916b9d282c54a2e8fb2f01ee3f2db/85900851668.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/jinipajet.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/zirilolopisiwi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0c06b6f71---77273910815.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/46071879706.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8047595dc---fopelojirikubawipiri.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db14ce27d6---wolegadezedi.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210611083816.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8b643020---gurisikibinatini.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c87de881c30---58093670328.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c31e7c76fd9---40036211576.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/26977952932.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/42993834505.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/101naehi5i2ru9b87iaj9tl7sj/zubovupebadikegidok.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0c54a31bc9f64b7884d6a33548cf13d8/mafubizugokolugegodulin.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/xinemikitiledazegedo.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210731191537820468xljl23.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/38217233353.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/41678884590.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/92175572754.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119e06b204d8---setamarubufejomalon.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/kopodamakenumapuw.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/41706624761.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/fivujid.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/noxobobujigazufugo.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_off0000c777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 10364 bytes
SHA-256: 41c6b1df9ed4b919de7025677f955854369ea164b07a0ddf47a9ff4a61e59143
font_02_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 17576 bytes
SHA-256: 96d0882a42d63bf8108ee82fff23b3e31ac1059728b11a28c9df5126e0259e7f