Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ee426e73153659…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 04:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 536e22f9a5fdbc1d728a42a10d4501d7 SHA-1: 13604e9822b654c3f16913b65d025ce6cda13c80 SHA-256: 32ee426e7315365903ee53a75ca5550457608aee69d7a6639168f59ae64fd91b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable, but their presence on suspicious domains warrants inclusion as IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://tepihtrava.rs//files/fusebuluxobawikatokefop.pdf In PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43529988165.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/xabuvipe.pdfIn PDF document text
    • http://ezibra.pl/upload//file/keseduso.pdfIn PDF document text
    • http://clerus.hu/files/file/kivavunabisamiped.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/fominovewepotukuvu.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/24236654202.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a65fd7e2bb---81162457987.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/xifulobudobipuzekaxaso.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9572bd1981---modosepezave.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/7p9715lhprl8ornhte0f3kr3k8/wedaporejapifido.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/zugapawupojikodepam.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716dca32e3d---35218292616.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7fd2ed138804a5dd80f6d22bf7b399b9/wixujogugiso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c851c5bf2---83922787128.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/34125036359.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/54770435666.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d59981d0---tofosulise.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8d5659f57e1b5783ae93fc88c34df490/fezazanagalebol.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/wolefi.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/zijujisimoriw.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/56973391017.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/16099608605.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210815063035.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/12248800589.pdfIn PDF document text
    • https://wasserentkalkung.at/ckfinder/userfiles/files/23755062172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=renaissance+period+art+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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 10612 bytes
SHA-256: c7766834cacfb991e190c84dcbd0bf69c2b70487c1adf8e63c22587a16550c48
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 17272 bytes
SHA-256: dbce2282795cd21dad399451e7762a316aa243b619cd02d075cf98ff968295b2
font_02_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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