Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3100c0739d7f93c…

MALICIOUS

PDF

76.3 KB Created: 2021-08-20 17:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8a501cb7a1c09ff3580197e40d79f67 SHA-1: 90bcb06348fb6314e7e3432014c5af6013870ff3 SHA-256: e3100c0739d7f93c291886ba1e40af24c02d38de34bc0ae034c0b3195c42e2d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which are compromised or disposable. The embedded JavaScript likely serves to initiate a download or redirect the user to a malicious site, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • 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://darienhigh70.com/clients/878490/File/84408749634.pdf In PDF document text
    • http://t-p-fortune.com/userfiles/file/73844994717.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/rofukefonewud.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076859b000f2---44006035190.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9594d3759970500f5934bd109959f80e/59557931952.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/94177478393.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/86386828077.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a08761425---48041314989.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/21305653757.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/5bo71msn2r67qg0o89ekonhdc7/62315179759.pdfIn PDF document text
    • https://angem.fr/userfiles/file/xudomabufujetamajile.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a4743edcc2eb22e03b1ae24486de4e31/69942594165.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/02a8ec9d40773104c60a191f212a0073/18450616046.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835e816292b---38065944691.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/50198195664.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/6951625871.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wijesaxukevagesumoseti.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/duvuwepipafadoj.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/xagowaramamovilurikag.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5cfc92eb---14221743347.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606e923cebac6---rodunuxapulaxizemidebelek.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/varazetifemuzakibezufi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a03ace0f6---15085855142.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/13632492699.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/vijuwurugosevitopa.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/bokazamufabepemokibubeta.pdfIn PDF document text
    • https://red-adlay.com/upload/files/gomoresexilejofibeni.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/galokimabik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=discrete+mathematics+and+its+applications+8th+edition+solution+manual+pdfPDF 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_off0000c660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 11196 bytes
SHA-256: 543671565b40351533e7b4437ecf3bf983d72f0862aa72a5f3def5105be2eaff
font_02_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 16308 bytes
SHA-256: 07446f8375114378ec62dd6f2b6d38ea66cebd600478671ef042b5a1dff45e67

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