Malicious PDF — malware analysis report

Static analysis result for SHA-256 3399bf6153d83018…

MALICIOUS

PDF

115.3 KB Created: 2021-07-09 09:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f961de9af6e2e3cf9653b6de90a5b5f1 SHA-1: 4930fea1742b8a35bf8461e59d674f1fab9b4dbc SHA-256: 3399bf6153d8301865231c9b57d121ffd4891b3a7356e89d0ef2efa7b5e1a38d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through 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 0.9925

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://coretry.ru/uplcv?utm_term=mid+module+assessment+task+5.1+answer+key PDF link annotation
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/51d8b2e0947f8991a57c167932b2ea8c/niromija.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/46555948537.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/wijewe.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/36867030942.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/69012514376.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/dofobobagufonateminipunob.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/gekinomojefavadefafolabu.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/213e9ee67c210ee00f6119058e1c57e9/gumorukijajexetinaj.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/20827881520.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210625213346.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b636cb74281---14115286731.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92103032987.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ab8f0216---pugewuwefamom.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073745448463---83739134615.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/po96lbbjt4nacoatbh2tb7m9qn/17915382528.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9456dd4e84---jijagekakuv.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad615cbf32---bunopuzu.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/juvego.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/cu1c70k9l9oremsgnd4macang7/nijoluzalesuju.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/tusisubade.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b916f59a422---jenivetomafe.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6df880f12efa940d10686258fe4999d5/sorega.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001414b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414B 11044 bytes
SHA-256: d80bfcdabaee0c51a639e488bc54d091a3bbbbe83fd72c10fc06ebc0c568563e
font_01_sfnt_off00015b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B28 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00017069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17069 20132 bytes
SHA-256: 4b7c9f17d6339a62cdc036134dcac27b57ec14873100875e7f22700d6538c214
font_03_sfnt_off0001a565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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