Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd39a06f2483489…

MALICIOUS

PDF

70.6 KB Created: 2021-06-07 18:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c28e2f6245e1ad3b695b74e7d5469a66 SHA-1: 2ef78854c80df0c0fe6aedc481f19d0f8f07f808 SHA-256: 2fd39a06f2483489df2cfb549881691dd5a779b43f8cec64299afaaaa9607c5e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://synerhu.ru/uplcv?utm_term=hindi+comprehension+worksheets+for+grade+1+pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e578670c8---xalurin.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/j9t68tlruvjjb8fa8bn2pk5202/kewunufilexivireweravaw.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8bec88b94babebffcee9951c56c64128/xagamamefixanuzunenonogul.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/94c14f24975f7d853cb52dcc34c22d79/38667874313.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789c465c646---17870570619.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160728e985812f---44480479714.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160730bf21d208---naduridefu.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/mujelozawudap.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8f1345ef4831bf0c776863d47aedc934/17813433021.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4kc58e41ss3pv4dujghtvi43rf/xavubepibaki.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/55367025278.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a24091e8be3---vifovori.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/4e9qj7ae5le0jvjqmgoabr1qtp/90778796013.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/18a07381aced893f1690030cefa761fa/rivuj.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6ebedb21---60582945112.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8a.bin
916535c7f3a24203bc1108f9e0bc3484ad1818055cda6005c3667e2d2eb82149		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 5704 bytes
font_01_sfnt_off0000dddc.bin
8cf73f3207937a42e968dbe95a7a7db91f3b7fafe8136e4ede320c7903caf904		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 9856 bytes
font_02_sfnt_off0000ffac.bin
6492fd9f71ddaea87072193a92e279dc0d2abc7dbfa82766f2a673570b0540b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 3408 bytes

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