Malicious PDF — malware analysis report

Static analysis result for SHA-256 862546c5eabee1ca…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 18:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28aa9934f3c0bffb8485b48090e136f9 SHA-1: da6f4333eba763ef6656064d23abc71bdd140652 SHA-256: 862546c5eabee1cabbc80a7e4d0737c775fa8bfd02fc7eb127b4cd68fcf617b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to deceive users into clicking malicious links. The presence of multiple distinct hosts and a high number of links per host suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rjhia6fqedrdq8uknbjqgknlrn/nisuvudotugiwijopux.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdce0f99387---katokujum.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/9d440a5b632bf028b99d6265ea2c3e4c/30192611332.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/32937243666.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097781e6c59f---66093629821.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/01e3ee68e6e25ff878193e1b158d8746/429693198.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/35576961774.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/24/kemis.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/dj4sdil3ms5pq98mdj05apr8qu/mizejizap.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/suwilerexogifokujasadopi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608185c34f497---98655342529.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/71ad9378a6bad76e4046b235a708066b/94251595467.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/1415496329.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/63797320150.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/n3agk3adgmrfsr2ldmgla8nv96/dobivuvega.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770046656cc---46878958932.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/19017846166.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfcf36baa---80703084662.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/roxaz.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/fomuz.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b02f1504bb7---71080615208.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7aqqb8pif6ss0d1ft6hqftg49j/73739072006.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ce6f012ea---27633086321.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d7bb8aed---65770967322.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///6277505075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=good+night+everyone+quotesPDF link annotation
    • 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_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 10784 bytes
SHA-256: 578122302a4ed8e9c52bdb9bdf6a7d8aa9ba325a2cecca0b00dcf608a8293287
font_01_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 16472 bytes
SHA-256: 3846cc5fd626ca842b3c72c70df3f6e30e8cc0265ab88049f1d2133f8c360062
font_02_sfnt_off000143c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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