Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ed72453c251f6d…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 08:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 33cd35399d6c528a5f59cd3e6ee3d387 SHA-1: 6d0f66a823ba48964f07753ad2091d27df2d104e SHA-256: e6ed72453c251f6d3fe417c49029c0d7c232ded981ea0976c05afbc5f0e8632e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+watch+webseries+for+free PDF link annotation
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/lisabopumafonorivonakaw.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/51210047607.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe5349e5b---3686812056.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/burivasizipumalevedaj.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/85992330125.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/87838176973.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/batezoxazimotomiruzukawid.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16311145080.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/16721766375.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/5006666530.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fcu7b274aqtiuec643ur7ge6n9/bisumalodiritowilozorup.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/wesub.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/divujexo.pdfIn PDF document text
    • http://rotang.net/userfiles/file/57056730646.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/12522688875.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jegutarinubo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/5519751104.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/45602558205.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/912e33fb70c1a377e0a5ed7f4c49bae3/vodegenibiripab.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/zotujavo.pdfIn PDF document text
    • http://www.bash.cl/media/file/90544355982.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/91989799952.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/nivux.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210901140459.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/rogusiganimejoboxusewisi.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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 10500 bytes
SHA-256: 3bd013c83fa92b4845cf143e6ecc899ece8f0215ae260937edda34dac6f1535c
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 18920 bytes
SHA-256: 65b49d562f8bf97df288e890c324d98f7b35e1d038f16cf8bd5bccfb9eec606e