Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0a6b61bba96e1b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 06:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 679429d0762a14f8eab59aef3573704a SHA-1: 085ab13c015b35324c2f22b9a62a26c4759b081c SHA-256: cb0a6b61bba96e1beca89a9da18995b0d22881372b0d9e3afdd86c30656d5da7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to redirect users to external malicious content, potentially exploiting vulnerabilities in their PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082824e2e174---zevuveguf.pdf In PDF document text
    • https://securitydm.eu/slicice/file/setubokiwige.pdfIn PDF document text
    • http://z500.si/files/xejafijukovapikisiwefadid.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f510e27b9---4159041051.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/keq1vgf7ioquib2uq5nc4a06ec/10596273785.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/89104939472.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/julepoligunadafubelorafiv.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bebe3bc5962349280b4e50c63f45cf37/11373197229.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/28339305031.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/81e6e359ffab64760ef39f16e898302d/72899860727.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/90400713669.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/54917852479.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/masaxapufanerov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237dc629f50---bokopesapikuxozanuriweriz.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/waragifipanenagojuzof.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/savenilumenetiliponij.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210608_3EC29E91A7B51825.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/siziseza.pdfIn PDF document text
    • http://ymmicro.com/files/files/xolebu.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/47278663567.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/727fbace44d7ee40d0c6956be26857c0/suzim.pdfIn PDF document text
    • http://aimic.com/userfiles/file/salar.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/rexepalotinufab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=educational+implications+of+metaphysics+epistemology+and+axiology+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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 17828 bytes
SHA-256: 0d8c3c40620bc71a3a2a7d407d4a3af8718113a73c4911a42ca721e5cb1d84d2
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 11264 bytes
SHA-256: 30afdd1acb839d2bc3ead9daa15856ebf08d6d281e97fd2cd15a7c6a35c09632

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