Malicious PDF — malware analysis report

Static analysis result for SHA-256 4557e45e104a3169…

MALICIOUS

PDF

92.5 KB Created: 2021-08-08 12:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed79ef2d146f5c329c65ccf11548c83c SHA-1: 5842a230e3f3a55b32273f02c493df06517ac52d SHA-256: 4557e45e104a31699af52abe8bf4d78a702462e42aeebcfacaad53654d57ed22
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detections, along with heuristics for compromised CMS uploads and SEO link farms, strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://irlanc.ru/uplcv?utm_term=causas+economicas+politicas+sociales+y+culturales+de+las+reformas+borbonicas PDF link annotation
    • http://chieusangducphat.com/uploads/userfiles/file/18208817811.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/kanexifixavivetezaka.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/58335987635.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dbfc9085---97747482744.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/02be450c845c17b3bab91a6b05b32843/50379111618.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/tetujefatonisironaxut.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/28287566497.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/16719251319.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/86579191640.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/72606143013.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/25304614823.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/kokoniwobapafedonuwowepu.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/12725154129.pdfIn PDF document text
    • http://pneusmarene.it/images/file/soxenuwoxa.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/dewijipod.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/newigozemetatasudo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3b32f847c4896903030940d6d488367b/82687936961.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tc5cq08f82oi7nba1mrcgujkin/47604764746.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac1a314d5---zabepazugabakajesuju.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/vipilete.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/pugabimufiwifazavilak.pdfIn PDF document text
    • http://runo34.ru/attachments/file/ruwoleg.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/fugimefaxojaziwif.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_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 18948 bytes
SHA-256: ed9287c1aba8f50d476e5b7392f6860d6de68d86b03260695ff6bd43ec05ff46
font_01_sfnt_off00012ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001480e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480E 11168 bytes
SHA-256: bf0b96d13ffa0a1c42104671e8d794e3199978a8ed51bc56635d790695b21056

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