Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eca8a142bcf91b…

MALICIOUS

PDF

80.0 KB Created: 2021-07-03 15:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8653d90aef850939dd84c57152d17fe4 SHA-1: fededc8c1076368a4892163bc3b774e2c1259d99 SHA-256: 21eca8a142bcf91bace04d51ebeae3e57303368db8bbdcbd944853235965fef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF's structure indicates it functions as a link farm, directing users to potentially harmful content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=the+dream+keeper+and+other+poems+pdf PDF link annotation
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d650327c---naxefovabejapojozomu.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/45046585366.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/17846a91ce52e53237db18b5da99df1a/26043333794.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45180959bd---18838302246.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4d1cc6c6---tolebez.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e4d6b09e3f228a343f7a36b065b552f8/18959735330.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/16807679154.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a02179426---41093779049.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5jquqr9cdtgqne5br0tfadft86/tevofemolorudewebawibiro.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8dc479e7ff975555c2e7f1a4923f10f1/meloxulejesugoxibizivu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/rimakujefuxav.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf6940a63---wutugabizefebabamiza.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7fab4f88---xakizulerira.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee54a66515---fifuz.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/ledojigodu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712ffdc3855---mevopojilizizojusim.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834bb164413---neduduzuro.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e37263eae---rulupupive.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/86589224490.pdfIn PDF document text
    • http://mp-journal.com/media/file/59568611429.pdfIn PDF document text
    • http://susutour.com/userfile/file/pavuzires.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c34c708c---70488255403.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/2581152889.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 10680 bytes
SHA-256: 994c7e83938462b92d991194d2c5aeda86f8e2b0ad374a86ccd89902501637f8
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 17688 bytes
SHA-256: 7f53b79e9d45be4d222bf77391b6ad01b897020f576df4879a3b5622b5c64ec9

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