Malicious PDF — malware analysis report

Static analysis result for SHA-256 460b7e10f815c783…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 16:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70ab539eb0bf363d700f95a8b5ff1492 SHA-1: e4d402271ed48d6585d4cd804af1c20a943f97a3 SHA-256: 460b7e10f815c783881ba54c0d029ce2acf2dce17223c3e1bf93300d36045d98
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous links and the detection results strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bakefruit.com/uploads/files/202109052154006610.pdf In PDF document text
    • http://naphogacomposite.com/upload/files/ketote.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c21ce5312---62707322840.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/78229916090.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/11320265959.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/ladezerufukabevesovura.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/92983495209.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/rugabewitarepikesuzilus.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/267402659.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/pugixexu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bolekodenefo.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/wuwowadezox.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tegeti.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/14540478958.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6154daff8---sepub.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/vajijamozu.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/pozetoga.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xesotuzusokuf.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60359dfb6---33057446754.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/65797972205.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/89111208877.pdfIn PDF document text
    • http://autodilygood.cz/files/file/11357670282.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210911024521.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/zabevefobav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=shubh+mangal+saavdhan+full+movie+watch+online+freePDF 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_off0000b49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49B 11392 bytes
SHA-256: 85da2af22d3da186d4587320e7ee258680f493fc54ee06bcf86e5863020fdce7
font_01_sfnt_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 15812 bytes
SHA-256: 09c6ae4d2375ed1ca70112661c5ab3862328253a854176c6547df4a3237c0067
font_02_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1