Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef05bb66fd1d9a2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 18:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61c2fb4591373ae713d437b79bb0f3dd SHA-1: 9d589a92499a5acd954c98e7e79f275d7a83f04a SHA-256: aef05bb66fd1d9a2b25f1e35b89e91aaafbdc944bbb31b78f994c524159c6b6e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://cdmvt.cz/sites/default/files/varegida.pdf In PDF document text
    • http://robwalker.net/fckupload/file/18809753809.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/214a8289deb30b75e9f18c996e226f35/18765977572.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/32571627317.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vevililekekurominibibin.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e75c001e078---noxalebirukigunap.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/603a228819c801a3bb97a6b273e5c11d/punetegugevosinir.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071da7bd66d6---72653610775.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/jokevemenezuriziwonatit.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/76910532889.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/3530435730.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca68d03c39---19132600611.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210727_81BB80B54C25740D.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/59131503394.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/68764864730.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098376624f61---figebugi.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160841134ea720---kaban.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/41948527c82bb3595075bf761bd2c14e/zuliperital.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/oreterenirawir.pdfIn PDF document text
    • http://domplus.su/userfiles/files/lapuvu.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/tibud.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/84876698790.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/45615362377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=complex+sentences+worksheet+tesPDF 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_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10696 bytes
SHA-256: dde4a20d952cdc86fa2abae92411e2c02831427d76f2148bbce289fec4b24ab1
font_02_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 18264 bytes
SHA-256: 6caa49d4ec4cc3730167c026a18442bb2a99a8b29e19b47e10415726d71f4cc2

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