Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e2e36a18063a4a…

MALICIOUS

PDF

87.6 KB Created: 2021-08-09 21:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c935bf3d0a4048b655bd0524adea182 SHA-1: 13da79519ce0a35a25787b5ee02c4e7bf80466a0 SHA-256: a9e2e36a18063a4abe3dbdfef14f178a1d9a784570c1c56874eb6a224b5d2cfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40970ef44---77841901799.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e60217a242f---pezexotadu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160989b49126b3---gumukepekosogufenepuli.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba1b8b803---44342423819.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/88641801420.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/tevosarugudevevofo.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/kewavinejepop.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tlkt96tt4pq31fv5r5i5dbiia5/jenabitebedufozedul.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd684dbcd---64754607482.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/65d4276e768320eb931e264ca04b26c2/51906738280.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2327b1c499bbc27660276aa68279fd2b/nagodinelugikobumadurogi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cabc3909173---89423456939.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mokezofawijirikalikotiko.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/zixadetonulizusidu.pdfIn PDF document text
    • http://dd-eng.com/files/files/fufozafujodebakodoka.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/015bb78f6a7d6aa7284f873853915dc8/najixunimu.pdfIn PDF document text
    • http://accronline.com/userfiles/file/pewoditizogo.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/10233927575.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8a04d5b02a6d10166586c75b8aa34d27/vekifom.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960efe68e6a---71861841044.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3c715b815---22171177661.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xisilikepozifofifowok.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/23075246924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=yellowstone+season+3+episode+9+paramount+app+not+availablePDF 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_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 18020 bytes
SHA-256: 10c466c2fb7dcbb470a45cf0fd1f0c8259ee9579c6e69065af1d90801fc4294c
font_01_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001363a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363A 11268 bytes
SHA-256: 3ac7ede6fb0f9de87cf39cb610067aca0f1c4b7f544b91e40e4c69470cb731d7

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