Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb06cfdf5282ade4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 00:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a695c95c7f8d65f00b35f1dc57aaf7d SHA-1: 755b7c632bb64f1767b1cb2ef66a69f47d33b529 SHA-256: cb06cfdf5282ade448fe3f59c2369c12dcc9de14b621f7a09443c13ad1085e0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. While no scripts were explicitly extracted, the presence of external links suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=what+are+metalloids PDF link annotation
    • https://idd.no/ckfinder/userfiles/files/4997004818.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/85579884416.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708fb420179---60137479262.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6285119cb7c09d670bcaef50c33a78b2/xukunowubafikilarulaw.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/gdmo3dqhued6e3gq1vt0ddu8s3/40890735731.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51762067---sobubatosup.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/misaraxuj.pdfIn PDF document text
    • http://livestocktool.com/d/files/rolepawigabesibere.pdfIn PDF document text
    • https://manenshop.com/upload/files/lerekizenigamo.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607199a4ce2b9---57276177258.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/52696354329.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/xozoraso.pdfIn PDF document text
    • http://orem.mn/uploads/files/2420388032.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871326b350---74741142093.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5fa009e8f---xilarudexagoze.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/zimezunusetinopedozukim.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/22122509ac6bff96a32cc826c2684ba7/24575780331.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/de7cbf2bcef8cbf39a711d5db5ce6aa0/kekepipexap.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/jagakuxurewiwod.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/36436538384.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/98240069218.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d912c8bfa---53643513998.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kifinegutusil.pdfIn PDF document text
    • 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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 10404 bytes
SHA-256: 786cc36591b17c1483cc8059059400fe8a4ced80ecbe8695a5fee9bf73a825b6
font_01_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 17236 bytes
SHA-256: 876383096a48bddf3e2560941d431f295a9e81426d955323c0f865b46ef96590

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