Malicious PDF — malware analysis report

Static analysis result for SHA-256 86444532a4efd1c5…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 07:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2618d766d9e30c91f3fb11c6bfefaac SHA-1: 4874fcac2ed7d298a29ffeeefa05e3ed5895363d SHA-256: 86444532a4efd1c5717b3aee7e1ba3fcbdf6c66e68eaf9610601a6571fadf12b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fof8201np1gp0e2g79qj2d65sv/kaninagabedotirukupo.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/97552a7e3c0dd4ef2734b544f52afdd7/masoxomimor.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed8330d32---gepemasezuvovoli.pdf
    • http://z-i-f.ru/userfiles/file/9252442757.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vk9pejdoqvp6o8ks81b0n8a9b0/parurupavivebonosup.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b9b60eec5---94292798970.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b150e592d86---31543763507.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df376f165---90337745049.pdf
    • http://bhs-class1957.com/clients/35434/File/guwubekajofapawa.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8395b14ca9---zidofovu.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28178375c---nitixedug.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/62e48abc41342b01c19a41b4e4d34c07/32975194313.pdf
    • http://automotiveenergy.cz/userfiles/file/48015568.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b1403e09---zupumaxosusajilawewajezul.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/8sitvr2e5hvgmo26cil6i1g3e2/35443837731.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/492ec13ee20cc5d0dc0448de7a4a9656/16987839216.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9bv71edgmh0vqjghr5t4l5qob7/41174668130.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/k6g407711cpdu8n9rt9dvjl451/golem.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc459738a---50593425441.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3i8gvup7fsogn7givphleevqbm/92633381879.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be93443b442---namimoku.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988548afb19---toxogimiwu.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/73871318116.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd02669bd---gelenu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=robot+games+unblocked
    • 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_off0000ebc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16792 bytes
font_01_sfnt_off000103de.bin
96ff2787b5cd0688e9b7a492b72a2a29194f9d3ad7f4b0fa6236319a7b6569c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10896 bytes
font_02_sfnt_off00011cf2.bin
7283376b05c6f79341435563e8d4334ee28bdf1122a196566f9afbe21ca682fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 16736 bytes

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