Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f1477cc94c354c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 02:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2091b0e5ae2ffeefcad9efed64ff11b1 SHA-1: 2eb94e211ab36541d836f2a049cf683f697ba131 SHA-256: f9f1477cc94c354c3f5a318268c096b084fb34f7835d319c741ec20aa9a3f264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest this PDF acts as a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://philabc.ru/uplcv?utm_term=coconut+oil+saturated+fat PDF link annotation
    • https://www.ewdel.cz/ckfinder/userfiles/files/21790772246.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/47761039077.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/lorilimudikutafovaxoxani.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/rumokimiwavetukin.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59796312273.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/vogusomiribodalagezezev.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/40966136467.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a2mou8bvn6j3mh7j4qdprngg22/60031504679.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/91126000730.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xarimixosefaka.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/newatelimepumutekisigev.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/bumumebezep.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/20237683901.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/68400634717.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/13965262970.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7516ff823bb5c951d2452c426e054b2c/70843324503.pdfIn PDF document text
    • http://ecole.ru/text/images/file/33182094238.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c51e082fb---butuxuromebalewus.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/80413117783.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/43575072447.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d36de78413---resejaromuzewe.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1dd19624---bodov.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/sagidazexotitakad.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_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 10600 bytes
SHA-256: 23d184442a449195dbffddce5c0182156795f5439115618a8214fbce210f742e
font_01_sfnt_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 17812 bytes
SHA-256: 846ce1b9c3b5ed438a28c21395f12b3951352ac95a030f5aabeb15ee9d409219
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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