Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11e893c8ae8e5a0…

MALICIOUS

PDF

85.8 KB Created: 2021-06-21 19:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dfc0e15846c33c77566e82b6badfacbf SHA-1: 16e174dd9107c29e867ade36e2ffb372490bf7c7 SHA-256: c11e893c8ae8e5a06415e6b80feb908d1b185a71c90b0bb7207cc7dd0f260cb6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://samnakthodrahassob.com/userfiles/file/xodowarawo.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd0fc5ca0---motuwugamokadarapelamuke.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/38483005798.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da82b9b2e0---49416147461.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dma3jjp2q302c34hornqiv71e4/sageximutijozerevawu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d41519bd8a---99798944137.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile/%5C/4534484632.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608208a26b864---10928952389.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af61df5f0---morubumuto.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/031f7fc0756a90cfca9ce105a8f21dcc/77555749778.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0842b8aeb---parijogamupisaka.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/20232063559.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=idle+heroes+anniversary+event+2019PDF 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://scripts.sil.org/OFLIn 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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 3144 bytes
SHA-256: 956fa7cc3b8c37845d08d5a9e1ed87c16e4528763d576519404b38433410ce58
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 5496 bytes
SHA-256: 5270538604edc2cbe8bbe91e85333093235e672d60dac383048ca42f07d1badc
font_02_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 12012 bytes
SHA-256: 84cf851e6157f0afbc92ccafdf5418aa4f92a8feaff5b577af47d6e44dde8e3e
font_03_sfnt_off00013343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13343 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073