Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a398a95102efd8…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 12:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6970fcf160d62a17c3154a6a8e198563 SHA-1: b2f878a603923d596a81ad1370c7f45c779b26cf SHA-256: 23a398a95102efd86626e1098911838f60e7516bbf40d14887d85ffaf8764ab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to exploit user interaction to visit these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160907c6fcc0c6---86387962480.pdf In PDF document text
    • http://willowslakerhea.org/userimages/bamexewadaluwupumutet.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/15119532980.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/25066816763.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5cec5f6eb---58186806843.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ef68127faf87ccb5ab64e10336c1faad/newitekugexim.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/tuwutewafu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/fapukiwokidogikuxodu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c4a6c8bd31021ab807a5aad6524a0dc6/12213500254.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cef25799396---lufizuriberavizamebuj.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c144add5ae0---48724814935.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/dejowonamit.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/30776292028.pdfIn PDF document text
    • https://ms01bet.net/contents//files/gebopefenosejilesab.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1967cecd8---gugazixuloz.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/xekixivawa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acff7d57626---63016626316.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/vobeketukixe.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/xelewiguxabusek.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5m5ocfqicf49psvvd7j77fcsto/gebolax.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/19467438767.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/sizewetebabusu.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/4687081125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=extract+file+pdf+to+jpgPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 10736 bytes
SHA-256: 5632d91ba9c407147cae88024b82a8e30d1b7b9c892389cd04bab1b05c7f7470
font_02_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 16260 bytes
SHA-256: 32660f0fbd0190cd5086e54ad5e46b5a77b68390ee8c01c50cf357f4b18f8fcc

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