Malicious PDF — malware analysis report

Static analysis result for SHA-256 28df1c057064d3f8…

MALICIOUS

PDF

87.1 KB Created: 2021-07-23 10:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 925c09795254e257040e63e64f1f33ac SHA-1: eee5d11d206f6a5a8277c185b615c23c805620fb SHA-256: 28df1c057064d3f8bd9afe7cae3352667922197732d894b6cf27cfa48dd2a928
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and links to numerous compromised websites, indicating an attempt to deliver a malicious payload. The presence of a 'download button' lure and the ML classifier's high confidence score further support this assessment. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/5hf53jam6apn0e93a6kh1bq2ad/47981066438.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c55f1059f5d4bac387537583a983c81a/59368896697.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb61aeaa03---misiridisavojajoxekopo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52a6194b63---vuwagopirorarasom.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9ffef3d7ba1deabe6778c584eb5f39b4/riwokadepomolilij.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/q01sbdo4pgl6uoq6a42s4q8nbh/76752711358.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b7c04782---vorojubosuvitogavuta.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1l9dmg3ak1cv3im65b66bjlo4n/jujeka.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/80b1d4510eae27eb4d6ca88fb5d889f9/gejitodosuwemara.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/jomedusud.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/vujetiremerebeg.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/derefodawebipuzokofikokej.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edeee4c831---tezaxumekom.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/bisuzekosojaxim.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kuzopuzune.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/48524400768.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2102c682b---24139712983.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b75b0fc688a---tenadijover.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/napfm5mo9g4mvcvos2s7coav0o/fakid.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a830750eee7---3463247978.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/wugirukalemuma.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/72247302617.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/21560191755.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2e2d365b---ravazodumelozil.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pukaf.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f345d54c9ee4acded9236af7cb1c0fdc/dawogonodegavapisedajapez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aptitude+pdf+with+answers+downloadPDF 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_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 17468 bytes
SHA-256: 3eee9b2eb9d9f88fced22ca21c0d82d335f29cfd7001362ebe3054088f049f80
font_02_sfnt_off000134d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 10764 bytes
SHA-256: 65493f4cecc0003ac15cfbc04fa5ccc33545db1a6639ca7e8b896ff5d96604a5

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