Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac86fcad4da2438f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 12:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c286499ac79d282b76df2cd1a5760c7e SHA-1: 07f0166a3fe3c65f13cd3026e989e1b4de99c2e0 SHA-256: ac86fcad4da2438f41e0996a62b4130ff4639e939a6fbe788a0ae9db4bbcc8d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an intent to redirect users to malicious content or download further payloads. The presence of numerous external URIs and a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=free+business+english+lesson+plans+pdf PDF link annotation
    • http://mbjarrahi.com/UploadedFiles/New/file/zoxufutoga.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a6ed90120---mopageponom.pdfIn PDF document text
    • http://e-hematologica.com/users/file/74029734718.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/54414325918.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/22643472747.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/44916964935.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d475bc3556---94441263184.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/34871937899.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/93151867506.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/4606716985.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/28806027177.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210903181253_751216881.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/3087684166.pdfIn PDF document text
    • http://hiniceshine.com/upload/ponafofaxarilarumug.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/masamebijaj.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f942e51b8c---xotelobonemololige.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f740739eef---fojoferapagokazemul.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/31085047807.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/milosuwugajotazaroxatob.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/lefetudepexizuxisinita.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/lobebolodixapewovun.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/20554154321.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d13e4ba0fa6fd848349628efabfa3303/fisiwitugizuwaxodor.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/fegazaberoxeximedakag.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/44038336665.pdfIn PDF document text
    • 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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 10896 bytes
SHA-256: a93dc2212468497041e033a48ab1f339bb5bb4477c4d9d2c4826860d8b5cfe6c
font_01_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 18020 bytes
SHA-256: 5316148579fa307c6aeb778c8ca84489dabd6eb37bffa511f0f36a46556cc8c1
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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