Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0508850771151bc…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 00:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 59aa7d8a2e9493b867c3658974aece6c SHA-1: fb67d5a48cf5d2bdafcb2bff869033f9e7d22fe5 SHA-256: c0508850771151bc7003f9566b057f2fcd48584e89cda341c9db4010c3f93cea
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142df64cc1c7---novolukajobonam.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613237f5cba9e---munedawekidi.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/zonefafifegubatajamo.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/33053561484.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/95173784624.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/5491073870.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b6aac0e6---58198011757.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/pitojotakowukivom.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/bilix.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/17805970788.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/nakosegujapirozib.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903045920.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/fumazotelaxox.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/webomirovadewukugezawoz.pdfIn PDF document text
    • https://signika.pl/Upload/file/61313025040.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144df76e5ac8---dexugakaliled.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/30305016760.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/sapagawevuzal.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210914/files/20210914152934.pdfIn PDF document text
    • http://1carl.com/userfiles/file/jidikofejovovekomad.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/rivamuxirowururazelod.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/24715052542.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/56403131348.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/zumivin.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/pivimavomowadikaxetu.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/junarubitumozasanamemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apk+mod+pokemon+goPDF 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_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 10140 bytes
SHA-256: 3bf6cdaff8cddfb3a3e96a40c49105269ec486cafad1e405e21338355719f6d8
font_02_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 18068 bytes
SHA-256: cb751e5943fef13a709d643231b155400a6e97702f5f0f5f3bed35fa73039286

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