Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d03f6eee403d639…

MALICIOUS

PDF

70.7 KB Created: 2021-06-25 15:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee89458b6bbf827f6b01e87e6f8d2597 SHA-1: 383860df036d7ff4dff4dd4818df56a37a62230c SHA-256: 3d03f6eee403d639617b981d8e78c0ed3c275d4874ff507041daae18c53203b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/27b5c7f95f9b87e2b339539f718c3cd3/loravuvakozarono.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dumewixufugofogazufoxo.pdf
    • http://nsfeed.com/_UploadFile/Images/file/55407146960.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/05376c3eb0efc5b309e97dd0b80f2260/32784369371.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbac114d4bb---28489269702.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bfd62ad7---rejemituvuti.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e7ee8896---ruzifekikixegedexobasoler.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/62c1dbd6c77fc4948568190f4169d4c8/38981025695.pdf
    • http://alnadaoil.com/userfiles/file/fadodexojo.pdf
    • https://bodegoncriollo.com/userfiles/file/zarev.pdf
    • https://salvatoredivilio.it/userfiles/file/nezarezotukudosuvob.pdf
    • http://goodslib.com/userfiles/files/sopaxobo.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/i6sda65to3fle2l7orjlib8l18/26377286474.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/wifanumoboworudoxojogovil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+flies+and+the+honey+pot+moral
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d3.bin
bd1ed1d2e5976a41eb91b756e4ec406ffc2d70f57c5ba7befbe82d8b2dc5e1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D3 16696 bytes
font_01_sfnt_off0000dd5b.bin
3a9edc9fdd5b28a42337757c9d2d40d0b161ffac99dd7e2e5402d4bbb9fc2e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 10840 bytes
font_02_sfnt_off0000f633.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 16792 bytes

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