Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c3cfeea6840251…

MALICIOUS

PDF

78.1 KB Created: 2021-08-17 11:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02ed1c2bcab308694428b22576c521ef SHA-1: 9c6f3930838d696af52fcf2cc6478c190bee30cf SHA-256: e3c3cfeea684025103d934d163d0d4b803361dea7f25062e1e6fd82710b5d079
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=free+download+music+videos+for+mp4 PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/r596jcpkkqpeanjll45lib5orv/lijerunaxakireriv.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vepigilupubemebit.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/29669659177.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210505202704753.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/nixilemetegu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2219962475510a449338d25a7e3eb4d4/vudisafoku.pdfIn PDF document text
    • https://kopari.hu/files/file/vifosurogisilibupakirux.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/86c56236556d963b1ea56f2a55f622db/kixikosa.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jkrcvfueqp1t41s7h135nsut67/12762226460.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/93668359934.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/13252830477.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/ginesiwe.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/06da41cb6fb0e28e63788490737e5136/davojebozisizis.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/tritpfdu1ft7b8h0pgjdj66ga1/vixifobonome.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e97a3defd---47831732549.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3055a680f---rugofusujekolowepavu.pdfIn PDF document text
    • http://cissi.it/userfiles/files/ragebixofubapupude.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/80970992724.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0c309ef1---gefapaliwuwitidaredag.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/41145234ab51856c76aafd7c26b0cd46/14829422759.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/86120218864.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60466533585.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aaa35ff3e7f0a3e305f234782189819a/61018080996.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_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 10992 bytes
SHA-256: b504054b257c5fa3594a667f0460ee84bf027ca9c10f2f3c83b8d36dd5c91d9d
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 16568 bytes
SHA-256: 62007870b37a8493d95fa9fb03cccc53332ba1ae93a79e349ba44e7ff2f94450
font_02_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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