Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacc74d4a57f6cf8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 01:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea7208c351f330e9750b0731fc40feb0 SHA-1: 55df2e6fd11466998d74ce8fbad84e9bee8c9b15 SHA-256: eacc74d4a57f6cf8232febbed68389eac6032643eaf10dda5b1a4bad005778a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were extracted, the nature of the URLs and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://edenestates.com/ckfinder/userfiles/files/25706059783.pdf In PDF document text
    • http://upnbkk.com/file_media/file_image/file/19574297199.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6357162608.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/8302390062.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161441e935e84e---59442046036.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/kakenujuxone.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/83603929968.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/vigadopebakotedit.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/mabulobumidexisawivarum.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/ketalunodanoguvurerugu.pdfIn PDF document text
    • http://abnicum.ru/files/file/85626801716.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/2083326276.pdfIn PDF document text
    • https://coevent.ru/upload/files/81786188809.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/dodomivodogisobagisafu.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908182022.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/3925327003.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/mudavudekoworuzor.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/fugirove.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613356a0cba66---46397325276.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wanavajofupuzemexabizevef.pdfIn PDF document text
    • http://clingac.es/d/files/54471576254.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5gvg6cq2t41plvhhn8qfian1u9/lepap.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/19628638621.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/vimufonidisabopujolar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+unlimited+diamonds+in+episodePDF 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_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 10812 bytes
SHA-256: dd5deda7ad258ce7ee324ffea1b44d6e16835cf2aae077e9cd73cdcec653fec0
font_02_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 17968 bytes
SHA-256: 3dc692c30c008d5b6b5230fdad323054ce244a764e92ee74122132b0be95fd30