Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c851c5a3ac706e…

MALICIOUS

PDF

88.6 KB Created: 2021-07-30 12:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5ef9d0d42c51ec2f164ea6cc8b39ab7 SHA-1: a8f72e3a0d85ba44c821da02ffd13565f7821511 SHA-256: 96c851c5a3ac706ec6eb4862bf9be04a2b4e158fe1cb6a0e5a3daeef2a4b0285
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF likely serving as a lure for phishing or further malware delivery. No scripts were extracted, but the heuristic firings suggest exploitation of PDF vulnerabilities or social engineering to drive users to external, compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/384d2a80957c706c527506348edb0943/9221408804.pdf In PDF document text
    • http://savalis.ru/userfiles/file/94834916501.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/tikorukewudabubidor.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/20929105022.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/59178359994.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l8r9t51of39erbtgqjt9i4vne5/kimawojemekevuz.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210622154209.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6df8c9b3---19228462408.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/pomuwomonejas.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/4q8ingh4u47jib71pskgo6irk8/36386952715.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c38dd2184a3---samaxowagesev.pdfIn PDF document text
    • http://epsilonsigorta.com/files/watigo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/radomamidawomirejasir.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/bagatumiwosate.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/46086810504.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16100116d04ec3---zisiregegu.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/32132528835.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/89926297280.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1fg7qv9096njpkek68psq6chuo/kobukoboz.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/fedigetod.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6b89e4ff1889374389b9edac63a84067/depogekavojiwuxipifinej.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/66af6bf208f74bf7a6a41ab188c1950f/53358943871.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/kagogezodozarak.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/69974260935.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/dcvk5ogvush3f9bdcq9tsprou4/50026949866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nizhi+tt-028+user+guidePDF 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_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 19932 bytes
SHA-256: bf8dc8033b15f57e11a583db048c54dcab9b756a9f19786bfbb665232fff3d5d
font_01_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 10716 bytes
SHA-256: 9b45a0ce1d435afe7f1da97eb74106e7a4c96fd1c3a59099396f06a73a43119c

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