Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9334c2ff914836…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 05:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f772ca3dc101aca42bd8e5ae24b40b70 SHA-1: 923914bbd9cc174285c02033c7c2686a1debb407 SHA-256: fc9334c2ff914836ff134b7afd2004013ec02524ecbfe3dbd70926a1c1c0788c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and disposable hosting. These links likely serve to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://istihdamhaberleri.com/upload/ckfinder/files/49475408400.pdf In PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/fusifudokutabuvobevuzesor.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/75265211847.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/96675599186.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/24625497844.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161393681c34fb---bemezexikezo.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/60102785914.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4n21ikiorv23n6e0d7mgam65cs/xosiwased.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905193414069.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109082342369850.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/vutowutizuk.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130bead5d107---vemonokuv.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d31d4db75---99374049809.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109041050507586.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/gedazavasivibitapilez.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/lonuxenomazavezexubi.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/38365378442.pdfIn PDF document text
    • http://skupka23.ru/upload/m/zodozobajurove.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/sovubevetopo.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/fuzorob.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/52813991323.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/14452134285.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/27383251593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=benq+android+mobilePDF 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_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 19216 bytes
SHA-256: fbbf12b7360135d6a2ad47ef8c3da1d083397aee4a7679c36cecc4aeb557d95a
font_02_sfnt_off00012d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4D 10484 bytes
SHA-256: 7945b93a8d12170f4324ec9c5e2a277a5322fd445c9a0e867f2db415770710b9

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