Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb11455841bbd9e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 02:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10188e845792324739be05c54d1833aa SHA-1: b5cc7b89dc99ce43550674a3c3a047110d693a7d SHA-256: 5cb11455841bbd9e8413c683020591449b557d47b96bf4cef67a654146924edf
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. Several heuristics indicate that the PDF is a link farm, with some links pointing to compromised WordPress upload storage and disposable hosting. The presence of multiple external URIs suggests an attempt to redirect the user to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=sonic+forces+android
    • http://pn-tech.net/userData/board/file/getipugotisiwejolu.pdf
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/63127816403.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3ac44d18---tutomumukerotutanipim.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b75e7b9250b452ea99349c1456eef71a/vopubimorukesek.pdf
    • http://yachtales.net/admin/userfiles/files/litakulisefelovejujexu.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/vogejunom.pdf
    • http://simkoongschool.com/uploads/editer/files/69542570813.pdf
    • https://whatshoulditcostme.com/userfiles/file/35877038535.pdf
    • http://www.hgekc.com/media/userfiles/file/40009991736.pdf
    • http://friulanamarmi.it/images/file/jizakosozadukoxakelimol.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k7ed66ucnhe2vn0u3l2d2990u1/1363494846.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/69690992403.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/46599944447.pdf
    • http://huabulaw.com/uploadpic/2021-9/file/2021090900354073499.pdf
    • http://imhang.com/fckeditor/userfiles/image/kepob.pdf
    • http://obraz-tlt.ru/userfiles/file/fiwixifurelipotimuvumaliw.pdf
    • http://thietbibepnhahang.net/media/files/38336123550.pdf
    • http://phdpecs.hu/userfiles/files/nebejifetupirarazisa.pdf
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/59759702008.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/kujak.pdf
    • http://aftckwt.com/uploads/file/33818416944.pdf
    • http://vipforiraq.com/userfiles/files/bepamabonakamalogaguzogaf.pdf
    • http://kahounova.cz/userfiles/file/58289435506.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b363.bin
249668a2e209832e9b7d1c8ba92b6d3d146b23da5f771e7520c9405aae4d4de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB363 16396 bytes
font_01_sfnt_off0000dd6f.bin
92edc95c8465d39b0d484fd19253a42cf495c7688f1221e7dc7b91a767783627		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 10400 bytes
font_02_sfnt_off0000f510.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 16792 bytes

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