Malicious PDF — malware analysis report

Static analysis result for SHA-256 6864dfac8bc447d2…

MALICIOUS

PDF

92.3 KB Created: 2021-09-11 12:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2872052f952c2843d13df2f4ce061d43 SHA-1: 651de9a6198a3fbb4e97607441cfb8b49330ee42 SHA-256: 6864dfac8bc447d20dd6936151237f772c10f71cf33de9d75dab221bfbf07f76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ciiinnovationsummit.com/ci/userfiles/files/66933580258.pdf In PDF document text
    • http://inspiredindianfoundation.org/uploads/42789157059.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/vajukevopabexizeniwamiwad.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/28537454405.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/7392981618.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/bezalolutotepaji.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6184781731f1a32d8f63581954ed2658/70900736866.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/rapujumijosumoxe.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/94372899274.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c52027afdf---zeguxesafikika.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/89897411740.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/voduvijironede.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/muziwewetukel.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/7983382512.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394bebc6c14---61246848756.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/jikavexe.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/16374819774.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613278d3a2b3d---wabikewekofaduzoju.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/wadalegobupesigimadupit.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/47701994636.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/96173345891.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/17114793468.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210911_93791E633B5F4E18.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=game+of+thrones+season+7+episode+1+putlockerPDF 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_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 19400 bytes
SHA-256: 7fc98c33f1af11e0ae7e3f6f39d8bb6424757bcc50faf9cb557c06f31aa4ce0a
font_01_sfnt_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 11220 bytes
SHA-256: f8a4383f844af569b54cdb3eeb699e40243ac00df06103d04a04ad1e3840b442
font_02_sfnt_off00014b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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