Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26a149f2cfdbd77…

MALICIOUS

PDF

92.5 KB Created: 2021-08-17 17:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 785e62f0ecb3b518a60cc157568d213a SHA-1: 924e4bc8e90728d2c48fe0403895c5c8adc1116d SHA-256: f26a149f2cfdbd77ff5f46a65440d310d593bd8b042c5d049a38abfbd9b3affb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The file's structure and URL patterns suggest it's designed to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762e4cb582c---vomanasewamugemumi.pdf In PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/talobinuvimopur.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fp1rlab3mohgbhm771qk0npo6k/pigoruwabufifebitipobiv.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac829d54824---38875134875.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/63451313571.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098d3d36f37d---17680849602.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf186a942d---45077911707.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088041a691e1---wekiziboja.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/povovozez.pdfIn PDF document text
    • https://cargotavio.ru/files/file/weladakozosuwonitima.pdfIn PDF document text
    • http://hydrem.ru/images/file/96478272037.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/11700035578.pdfIn PDF document text
    • http://360mart.net/uploads/files/guvererikijewelojofam.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/jubowojo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097ccc791909---lusifuxunosi.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/10345454000.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608160ddc8177---sumobenobe.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/baa5d9f16dc63d91c4262280faefbde4/jogopinamibab.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a947082b28---80151623935.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c03c0be---zirarurofos.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/kaviwojesorunot.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703443e4858---53990086658.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/11355900885.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/24205440085.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/topotalivadolugiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=exacer+colbach+2021+resultadosPDF 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_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 10888 bytes
SHA-256: eaef5de8beb2d998675608909cc0b0c077de82ae032fac0c038298de46963ed5
font_01_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 18344 bytes
SHA-256: 3e0648d0ba683a9cd3330ac38248b616f43b714522555f23ba74a47d03d75104
font_02_sfnt_off000149bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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