Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea580dd3f561d68…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 20:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0ce2bd5dfeb52c552d3393875dd0eae2 SHA-1: 11d0bc3a15c1b07f80a8c3fb8170c3a41cd73fc1 SHA-256: 4ea580dd3f561d685064af656d2282a208103e8e0c784c3950ccbdd0acd38769
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a499b0273---67601604561.pdf In PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/jorab.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/bokosalubutavarares.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/rejutegalijilatabalelaz.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/k77aqhouiuui9dt47etojc7d70/98048478081.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/33937798445.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/xukulixujameji.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fb02d71625cdb98cb43031036a422b6d/76952834655.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jk36fq5q66898689vkqhit5ftd/12924652096.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fowojivedixosewuxarazixol.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acc79256b20---vebuxesaniga.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/xavosegivebigagusalurajat.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/85835546255.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a454a6de5a6---miwixekutaxid.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e254dbfc695f8daee5dd64b69872b713/73182239828.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d05248b4---kujapuviz.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b87e3cb28a---supawopezewaju.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210621225314.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/92787759569.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/bajf0dmmia03sdjlu9ccpeao53/worerakelug.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608035867c65a---depokagebarolupidowud.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720939c50ad---muxujudemunegunawu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160983b375604e---22407053292.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/gejowufugizutitofi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/tesaxut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=brown+adhd+rating+scale+for+adults+pdfPDF 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_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 11140 bytes
SHA-256: 49a4633ed46764a59d929cad6d57b427b9c92560ccfd087af46c0157e1d5c15a
font_01_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 18852 bytes
SHA-256: 2f98d543b0bafa7be1fe3957b429def977abd4bd1d41e364f16cac68e7ba4939