Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa45f819fd1cac57…

MALICIOUS

PDF

87.0 KB Created: 2021-07-20 10:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 402408cf4aa98f43e2ee29d810e2ab7e SHA-1: fd571f84a51f85a6619b6c82bbce01aecc114566 SHA-256: aa45f819fd1cac57d2997f27364993336f4a7fe096c344a0da8923f3019458c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 Security Software Installation

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links to compromised WordPress sites and disposable hosting suggests a link farm designed to redirect users to malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document likely instructs the user to disable antivirus software, a common tactic to prevent detection of subsequent malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://skpizzasubs.com/uploads/files/rovoxovusurir.pdf In PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5a53880d1f656fe150624aec33352acc/faponibigizivugofuje.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/tenapupasafugexowetulax.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1b1a79309---faniratuxejozug.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9ce7aa321386cfb6ad62554bea5b384c/digolonufegovuku.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q3fbsgvcrjcnp9p54mnrh9he96/28121902560.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/risedisoxiw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ef2e169a---sizejumazag.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/witeposugo.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160868cd7b6ded---xemuwusowodedabawu.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/lowarokenixepiweb.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/firaxixuv.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1ea01b3090d1086fdd19d880be8c8461/tekojijuvovuz.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18907f9e7---zodudodo.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/57829922832.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b804454d5e---44167383314.pdfIn PDF document text
    • http://asvpp.fr/pdf/25307066286.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/giligibivewex.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff7dd4f976---wasopulokomudujozuguruf.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757039d166b---diwavekijif.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rexapu.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/29745537866.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a45aee49f---49918257730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pianoteq+7+free+downloadPDF 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_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 17856 bytes
SHA-256: ae496ff372e8ec5f4f072804d9a3eda5eca736a03b63ab652da31654d2ecc7ff
font_01_sfnt_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 10464 bytes
SHA-256: 460815264435d30ad670bb34e890d997dac1bbb6b9782c52eb8ed6415973e0a9
font_02_sfnt_off00013703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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