Malicious PDF — malware analysis report

Static analysis result for SHA-256 891da2d958d99d5c…

MALICIOUS

PDF

73.3 KB Created: 2021-08-25 20:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cbdb25e258e682059c13f6953e4814e SHA-1: 30c41e3869afb2477010c596f8a73f280d9ffa77 SHA-256: 891da2d958d99d5c4cf78116c5279820d45441fe7029cb51e03c0b3c6951d231
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external resources, with several hosted on compromised WordPress upload directories. The primary attack pattern observed is the use of malicious links to redirect users, potentially to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tlproduct.com/userfiles/file/jevefubedupetetawone.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5cb9c632---juxalujabinavimule.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/87708469158.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/famikowawidima.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/84468670310.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/20231523697.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/47195245627.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/73f76fbd6d438a71cee0f1adce3b07e9/jujubazefisosede.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/mizaniwezavabon.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/raranokekamodikuz.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/gavuvudasisonipusubun.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f74512580d699fb1c26328add1e66387/wividodamozujis.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/47988340296.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c187e0666f---koxajifamukisojik.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/32704691717.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lilumugezafiwuvug.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/67628553451.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/2494887645.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/61725577242.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c127a6cb2a7---18738128351.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d86fa9919---lodisavin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=change+of+variables+in+double+integrals+examplesPDF 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_off0000bc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 11384 bytes
SHA-256: 00f509ed007a00096d6c58aad79d1f37bda4c1e7754685617a7a4390d48c78b6
font_02_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 15708 bytes
SHA-256: c21e5fc8260299c0deaab20387b66ac77c9b6bca048d010ee542b6e5cccc414c

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