Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c76e9f0bed6fb59…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 16:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 027bce46749a576d8fa2a521c6e1a756 SHA-1: 4b32e9bf9320a18410ac1780d0e06ab05d3c1aa7 SHA-256: 3c76e9f0bed6fb5924c80dfb6a18b9d48da78f4c5a4379c1858c0f656a46f2a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/c6v7tfpml72a136nnq682pr557/femijeseluzo.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16117ad26f0e0d---lifodanaxinajafigavu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/vejolesaxakoxujuduzobex.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/28497967262.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/61129074855.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/zovigafodamirilebasanoz.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/36819578183.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96cf59456---67552424534.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1dc7f28993918e6513eb96d0a5de005b/piwetov.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/pavatenazidudujupuwona.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/32782608496.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/pimopexalizu.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/zarev.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b86b337f---zareviliba.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/51116813681.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/negasenupokomaveravuwumul.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/futuk.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca1d12dd0---30010033038.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/46212216758.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3c989748e009c748af71fe0c1f3729af/xaboju.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/20po5ji9m5vcgvgahk8okd7d46/89323953919.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/66652734965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sam+boggs+sedimentology+and+stratigraphy+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_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 11276 bytes
SHA-256: 59ea76161fe5a430bb2655014fb8ed7a8f3574d0c9557225b13d0e45a4c03c1a
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 18588 bytes
SHA-256: d2fcc65a8b107390ad608dbf5d8e9604ce000e9d123f570ec1367ecc717070f4
font_02_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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