Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6659212c043e94b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 11:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cda542b2d205c1156f5cb4d99e3f241 SHA-1: feb0383955f2817fa952e42f57b50f8aee351f62 SHA-256: d6659212c043e94b898abf3c08720ff97a1c52051c5a556af980200455c395ca
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this document is designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://iqmuseum.mn/uploads/files/57375096710.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607574b94391b---jerivewuge.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/45448540362.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e50ae43e---51622580987.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/31313081177.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/47798138350.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/fovufavex.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/86627960235.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/bujabivape.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16099dd3170bb8---49400364362.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/zekonovi.pdfIn PDF document text
    • https://scalper.ir/data/files/file/22890392299.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e29446f8e09d396579977f5c7561495a/89003650547.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eb665d266---34302142278.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/35505473140.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://fgosvo.ru/files/files/waverorufiriwalukobo.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/tezepedaze.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/32180438067.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/78d5ce81f318241851eca861e0dd7a1b/27041694547.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/42574348981.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d7ae458067487133622b931cfb1547e7/72635437457.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160793ef16434f---21816795372.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/wubin.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/55959588575.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/sajanebolitapawelifog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2010+honda+cr+v+ex+manualPDF 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_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 18616 bytes
SHA-256: ff4f0eeb8453b4e0679a50f3382c90d6b15f5ad7694c6eb69ea5cd701aa13dae
font_02_sfnt_off000135ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 10744 bytes
SHA-256: 0d015d5f707052c2a04d3610ab815a7084572073c0c48a414f72c46ef6a1198e