Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c943d1bcfe4057…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 11:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a6516eda6ff6400d255eae11f9e8208 SHA-1: b7399a599345f048a2598e8d428adc51ff6d0578 SHA-256: c6c943d1bcfe4057d19b3fd30da922d59c0e9b16ca7b6ff51a5b9cdf17369887
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of link farms and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cdmsig.com/ckfinder/userfiles/files/68387074609.pdf In PDF document text
    • https://apsco.ly/userfiles/files/79209204908.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/20147979609.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/wisirazeba.pdfIn PDF document text
    • http://pinxedien.net/upload/files/mezoxaze.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1f01f33b8532aabc334419dd5f7623b4/62743732247.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pijipiwiledijulib.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/11407331674.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/3660958947.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e13014740dd9300da51deb8ec31d8759/3255269629.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614660e0049d8---61205264888.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/32749096246.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/vetarafuf.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161491a4fcff0f---tokitusupogurib.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wosegop.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/gikuda.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/84757110931.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/10922718467.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/kanenaf.pdfIn PDF document text
    • http://ha-sine.com/d/files/lonokaluzinadelepadil.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/xebalasa.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/muxaxaxobax.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/87162009217.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/fekumur.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/zozexujaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=advanced+english+grammar+book+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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 15420 bytes
SHA-256: 56843e5ce3701ca88cc74fe5582e399adc67c4ac21153650a66590a5925c1c53
font_01_sfnt_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 11248 bytes
SHA-256: 4a18684cf6c6c5fe3fc484903eec8cefa240771c3d339819302801ad1abc60ce
font_02_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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