Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d55e4f295fd9c5c…

MALICIOUS

PDF

91.3 KB Created: 2021-09-21 00:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57a4ff0928301ef34add7732825824c0 SHA-1: f22f6bd2f56ec18c85a9d321cc097882a3a893a2 SHA-256: 3d55e4f295fd9c5c6abb86c32e5cd1f779d5597dce06786bd75a35cb9b5d6541
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.colegiodomus.com.br/js/ckfinder/userfiles/files/faxanidufavosalu.pdf In PDF document text
    • https://sskundal.com/userfiles/file/zedelusosajiluwomovaxaneb.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/88673905270.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/gisax.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630757482.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b1a0ce66---11575591166.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/35e0a435d48c0266119f4d356c11a391/40830252649.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/95808689653.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/19760893979.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/xasofubiwabijinizakisatix.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/nepirasavew.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/bojinovujotalewarulokekak.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109060647574658.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/monet.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/79597804256.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3f11d588---13553687071.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/subisemagotibezo.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/jomobapejeme.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/11745765256.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be598885da---pagazasanon.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/fijisiwito.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/xamal.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/68301558.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/puvovibokebuxejabeburi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+old+guard+free+full+moviePDF 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_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 10560 bytes
SHA-256: 95f26969bd147d0b18cbd127fc0736da18ea9b2d0c76b96c4b808970a0cfa3b9
font_01_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 17440 bytes
SHA-256: 93fdf0b79248e8ece20bd2d7fe7c29b0e415a016499f5ab6a5cb221fe0747931
font_02_sfnt_off000147eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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