Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b954bf923b15b02…

MALICIOUS

PDF

97.5 KB Created: 2021-08-06 15:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 847b17731280c2dcd4a92bb8dc526277 SHA-1: 7f1d9d933b5f0201710acf7bd5be452092371bc4 SHA-256: 3b954bf923b15b020115d126617fd24c10456b1e138dd681aba0064acb27a460
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=craftsman+coffee+table+plans+free PDF link annotation
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc28554949---68055906036.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7839c3b9ec5a64be0b62fe71834615c5/wexexawukirasesumuk.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/55828262939.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wodirarefanevilexepido.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4a4882005df305f1b69eaf6b7bec00a5/16654094336.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/87636284497.pdfIn PDF document text
    • https://olterus.net/contents//files/sidemakuwef.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c45455040eb---3794447643.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/c83688150ad06f8701c4d3c77440fc70/malaxanav.pdfIn PDF document text
    • http://namngonviet.com/user-/files/64073670473.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/toxikupijodutamugeb.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/famulaziselivalul.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab610353e---votidelim.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/moxomafopoviwurisefiref.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf04e5fee---jigosefafinetawidadoku.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/713fe85293585456a395dcdf9fdf3c94/84424789547.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/28447041771.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/da31de973289f77b20aab5d4fb520c05/52168908310.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/sepesipebozuvito.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070208354770554.pdfIn PDF document text
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/65629793615.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/nenurozodujifuwupeled.pdfIn PDF document text
    • http://chineseclothingonline.net/File/joralunegumutozoxezep.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/1363659636.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_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13370 10720 bytes
SHA-256: 84d9587f53245a0359cb18100f4eb66ed8bbfb7af2c9b93a87b4d53a210dedec
font_02_sfnt_off00014bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDB 16728 bytes
SHA-256: cafbd0916b05c6286d0bc821823f8e9d83a19ef92cc6dc95858738040f5c3353

Open this report in the interactive analyzer, or submit your own file for analysis.