Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ff8e81c9ddf316…

MALICIOUS

PDF

273.3 KB Created: 2021-06-28 06:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29032c3a6270535d7fa0401a91bfcbc9 SHA-1: 24d40b4cc3442c73bd10819ea41e10c74b351663 SHA-256: f3ff8e81c9ddf316e083c2675fa54825c3241bb5af9fd1f241cd30ce41f0aa76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified numerous external URIs, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure itself can contain malicious JavaScript, and the presence of numerous links to potentially compromised sites strongly suggests an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://coretry.ru/uplcv?utm_term=summary+of+finding+conclusion+and+recommendation PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50008cda7---wogekadimazibitera.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/72576501621.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/duwigoruf.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/95071af86edee96031c53315346e3d98/76297141787.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/otsi2ir2omog3vsvenai07t0u1/komurikexibesagobivupuf.pdfIn PDF document text
    • https://kede.org/userfiles/file/mixamefa.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lfcs4tk5g3dufivg7c5jut7e52/wukoviz.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1b3471c01c46ef3203b1c4b9e76990ee/koson.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/mirela.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c242ef24fe---pewejunumadamozupilemox.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6b1fa9dfd---65916409510.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/93576320904.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/nekikibarevuf.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xiroxelud.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8e920bf8---gibibefi.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3cfb0af6---63564831292.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767e1222b35---25396921711.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9597844df3cd45f2a673594056b32982/28093952338.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/37784314805.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zivowomibarimenuv.pdfIn PDF document text
    • http://ipceurope.com/assets/file/wanewat.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2pt12hms0mpok3fivf4eg7pgjr/98489118027.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e349dcc29c---zilituwi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c3a2052e---47799184916.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/zexawarilabowigitor.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824dc6338a2---rawagi.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_off0003d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D5CE 11108 bytes
SHA-256: da3a59b98e474f059820005387cdd4b3e5534501a8fc097a6a184e91091386f6
font_01_sfnt_off0003ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00040798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40798 17768 bytes
SHA-256: 3ec41df2bf3943510f7c4f7b044181bbe8c43e6c07b98542027b3a9680cadab7

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