Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e82daf35b53b6c…

MALICIOUS

PDF

88.9 KB Created: 2021-07-20 05:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a52fea3c84503309f155ba609108804a SHA-1: 88f74c7126b1e83e8c62e241f7abd575ee0dabc9 SHA-256: 28e82daf35b53b6cb7c6de3a1d6c994c27c93066fe253c9ec6095e041be9b857
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update. This is a common tactic to trick users into downloading malware or divulging sensitive information. The presence of multiple links pointing to compromised CMS upload storage and disposable hosting further supports a malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it may exploit vulnerabilities or embed malicious content that could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46060138c---48632708046.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b2f5f16e00165e5937644c6653219cc2/momesajajegimeremoxib.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160839c0e18a47---bepidi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e73d5a32krt6vqshnkp30u3o30/xujapubapamef.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609477045f2ba---jazetuwanugupuxadex.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t1enta6bgfiiq4j8opan3kctj5/73388721281.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed4d242729---86535434180.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/45421092370.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/pegozonazadafisirujepaxi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7719a73baf4d14b648d40ad43acf7a96/binipenaluvunum.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/94855672545.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/78297826494.pdfIn PDF document text
    • http://101balkon.ru/upload/files/tesumudota.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8c798997---desitimitivijixetik.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/powekazezuje.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210603084905.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/79839517145.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lb0il1ebqn3t1mi9keqt1mpap6/roxatulizanowo.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/27753066622.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/tojuduj.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc13e6f0f---79995933692.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6939c869b2b386256fa725895bb31026/gelanogukowisudoboziremot.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/91730815473.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/27148989856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=only+html+and+css+templatesPDF 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_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 17156 bytes
SHA-256: 7fda9b70284c75764ef2cca68f6d3139db2dea406e25f6d610deaf285b823916
font_01_sfnt_off00012718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 10604 bytes
SHA-256: f5100dc47c6ef06e155b0c08e2e186037a676abbac3b24d4b9c77eeb60e79990
font_02_sfnt_off00013f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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