Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fc9785da39bdf6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 18:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7391c5546a3e1c7b00991273fee0cadb SHA-1: 484e795c0aea1b5fa5f81ff860d2c3b831688e62 SHA-256: 08fc9785da39bdf6eb243edf89d28c562e12592c8173e6a9272841b46ef0991b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to external sites, with one URL specifically mentioning 'storage running out solution' as a lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly flagged it as malicious. The presence of embedded URLs and the nature of the heuristics suggest a phishing attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=storage+running+out+solution PDF link annotation
    • http://123podkrovie.sk/editor_uploads/files/kolafukimibiwiwifavo.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/12392260676.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/todab.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/45591420789.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/28111878017.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136f54d40f97---goret.pdfIn PDF document text
    • https://robertbah.si/files/file/jakogumafe.pdfIn PDF document text
    • http://hjhchem.com/upload/files/fowipunotime.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/jakedurularilerezutemi.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/53335759241.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/jurizedezumufawefi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc8d58162---47992126579.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/20605183367.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135627af1022---kibuziruzewogo.pdfIn PDF document text
    • http://bptramptour.pl/files/file/xexilowuvetekopotimot.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/83304009568.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/daduzimobiromor.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/47235631812.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/72118760647.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/83216584040.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/961eed5958bbcc8ad6169dded2507b54/mogorijowisegoze.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e391636df---rolerozakotororof.pdfIn PDF document text
    • https://cardolf.ro/files/62657609411.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/47654240235.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/jesofilefamipa.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_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 18100 bytes
SHA-256: 7a3cb2825fdc77f611f44865938ec08456dfc36c22f5e1bc08d54d8c548e5fdf
font_01_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 10460 bytes
SHA-256: 7c23f37ec2a50bce52f832bb08f20485beac121ad0af44d1a52055eca9568eb2
font_02_sfnt_off00012baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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