Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d99dcff84683049…

MALICIOUS

PDF

101.1 KB Created: 2021-06-12 15:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5feaf23498e5d1b6734462de288c8a72 SHA-1: 7e05de1ea1dbc0999221deade1ad03032fde1c93 SHA-256: 4d99dcff8468304961c05d655fc0d0b44e6b26a44fa1838d93453e2d968f8a0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/uplcv?utm_term=speed+master+n4+choukai+pdf PDF link annotation
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec5e61d77---rajukasatibulu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30cab9f5cb---jegovobugusesunipamekugol.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/fofinovuwax.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb67acb6a---95835352603.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b33896be9dd92cc91c82fda696d4a22d/xemexoduxibun.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835b1bed626---73353404557.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f026f3c013f1e4547cf29a6a6a33bbc6/fezosojonoxaxemagisa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c390a9dc9---52602788303.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/sojapawumukak.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/67324010299.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/sonaxukivenojegurisojawi.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c86acf98---12854135596.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a1211561---95347213564.pdfIn PDF document text
    • http://novichiha.ru/pic/file/79620835133.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1db33168---begam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 11832 bytes
SHA-256: ad342c1e18ff2914e5e896cc8c421a504f70dc1f745c4368829d51c10879d952
font_01_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 5500 bytes
SHA-256: 2e81daa61999da6f8cbc1e7e84f6990a910a5e4473a6eb0fbb4e502057b3c2a4
font_02_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 3684 bytes
SHA-256: 4248b0dba8fda0e2b318eae4bbc99af2709c26b073e26c82fc2096ccb9ec3d27
font_03_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 23076 bytes
SHA-256: 6c2509f093fa825dcdf37f89857d469305f34078d0caeb22af8cd5fb7a4f2b0b
font_04_sfnt_off00015f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F96 16572 bytes
SHA-256: 17b16ce2338a21ace66a4e40e30be3ef92359e6eaa4b8a994d7975f31ccb7848
font_05_sfnt_off0001762f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1762F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.