Malicious PDF — malware analysis report

Static analysis result for SHA-256 cada1bb706209e7b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 13:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5e3e496a347f9a242c0f07f2b71cde5 SHA-1: 05c0a50eb8c35b00c325388b4aab58ef234c474e SHA-256: cada1bb706209e7bd942720c7e126084e8d43a7fdb26ef69a598ea8674fa931d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=best+shooting+games+for+android+under+100mb PDF link annotation
    • https://lyubomiradineva.com/files/file/80823347646.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/gixesejedefe.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zibizilelir.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/suziriduzetov.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/rozeb.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c289cc382---gimifekef.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/45793262150.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/06a748bdef5e4d7ad40dd779b2f672a9/52994576468.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/41319241444.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/89439522248.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/19406684934.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/tilubeginizisexolefepi.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/98210558956.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/woruz.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411467aa9fc---vizefebi.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/bofetof.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/11162608370.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/fisalawarugube.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/bugux.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef787e43fb---36324450919.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/padikoninu.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/lipexobedebokagef.pdfIn PDF document text
    • https://el-tall.pl/pics/file/4843397300.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/mubimifukofakewajutaz.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/niwapop.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_off0000be61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 11224 bytes
SHA-256: 7f11d8e5a8d822201b435324aae52112e9e79da5bfbb51ebdf703f4bd5afec42
font_02_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 18712 bytes
SHA-256: d1d9802e911bfdd3a333c224525aef8c6ef2e1ef645a29b93c3d4fa22768e044

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