Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e86a79e79d14765…

MALICIOUS

PDF

82.8 KB Created: 2021-07-06 22:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6aa96659c6838be8dc76063dc14ec691 SHA-1: 89d5ba4642426f7fb81f05e6a4ede67de8c0ade6 SHA-256: 4e86a79e79d14765a9ee0418dbcb7df028aa45f7f4811c23fb9e771ab30172aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • 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://dienvietbac.com/uploads/files/paxowibubinozeru.pdf In PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/73747518640.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6565429fd---mejatutofobekar.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/42569277791.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6f88d24d2---jijexika.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdc289416---zefigujumuluxufuj.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d89b76361e900ec9c9d7a8745c060c43/dokamazepomopuwumagej.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/1661125844.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608040d1c933e---wewanazab.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081efcfd4f75---fowenogikatoxasu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a5943d64---kibizu.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/pefunimefa.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/dusadivunojipidemujo.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/2519946849.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/najamotatepo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d9f54c95---92027940674.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8be6dca3---vimigoxif.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210530_123215.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed55f0f50---99778347171.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/31850871447.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f71447a60---88667103421.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2d153759---rinelugeterulejexu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/n7b1pgc0atmh2cib140t1lb490/54019545147.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/3dc2d7e71b8ed4f198348cbe11ddffa4/71930267901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nyt+spelling+bee+answerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 10624 bytes
SHA-256: b1a4aa8a620eeb87c30f70992efdbdd10e0df9785495e4de64cbea47ab67adeb
font_01_sfnt_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 17248 bytes
SHA-256: bad833208bd6af1007800432f4880a99a8ee25b088b84bef4bc3c1b51ebf770d
font_02_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 16336 bytes
SHA-256: 0ba07f6d54a4cb2ae74247f97c6a926e6d6308299df35fe3bea2e399aa3885da
font_03_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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