Malicious PDF — malware analysis report

Static analysis result for SHA-256 6216c6fb1eb5fb89…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 13:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dba84e6eb48824e17a012a8795a89754 SHA-1: 783c4ec9e1e424cf4558d8dadf1af0ef3b1e7d35 SHA-256: 6216c6fb1eb5fb89badeeb35c2d3b732e9c8788ffa8f60adc16425fdf3bab3d7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document's structure and URL distribution align with techniques used to obscure the ultimate destination and evade basic detection.

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 http://aromata.ru/upload/files/76123507437.pdf In PDF document text
    • http://fujavietnam.com/images/Download/fezelixobagurowukigop.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a1573af995---vobavonenabevararew.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ppg7pun84k6aq7224sosbq98r8/11504355352.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/30097379027.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/tugulak.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/54325047823.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/97934669894.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607797c4441aa---losinogafasaxowataradum.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/1991559090.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d20358b61---15218252773.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/jijutodemitumapobupupul.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/569jprvpa5l9ajdtq4hi2hq421/volijefulufadizitumunuted.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/81464831714.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/22163139929.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/75bd28b4d7e3a082cb5604bea8780f34/90933244675.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b5449f7e---84297185723.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610bdf5f5f4f6---navuxeva.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/vovabavupose.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/21019061821.pdfIn PDF document text
    • http://haai.org/upload/file/71002529714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=all+full+form+related+to+computer+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_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 10496 bytes
SHA-256: 120f8d9c5f1904d7295e344534c6466c6b12dd38aa387513e3ed3ad23fb94a0a
font_02_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 17092 bytes
SHA-256: 155507c5a1670cd636c8f98ee16edfa74f3cd6db17df40ba47cb6c45795d709d

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