Malicious PDF — malware analysis report

Static analysis result for SHA-256 0beb48d952d24cd6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 15:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7fdcad86e5b66ba468bf0313945539ad SHA-1: f8aeff8d86577adeaecf0459e5a1e9c3ed75d61d SHA-256: 0beb48d952d24cd67838bb6b3f26747aaed218237d9487d2841fed297d5aa852
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting an intent to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=picasso+movie+apk+download PDF link annotation
    • https://bilalyapidekorasyon.com/userfiles/file/96794951214.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sunumujitus.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/vovepufera.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cqcvbh0jngqcthbhqp7o1eb6i3/91414956105.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/femodifufaka.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c1c8e096c07ff57a6525d9f3d06caf5b/3475475510.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/71087672295.pdfIn PDF document text
    • http://itena.si/uporabnik/file/wutegulafeb.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/65388172614.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/gesenaf.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138000940638---28321055124.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/xevirupadan.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/52551280420.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/19150865731.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05615a467---48322208210.pdfIn PDF document text
    • http://thediamangroup.com/_images/files/wajav.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/savutedurageti.pdfIn PDF document text
    • http://stylekd.ru/files/81116606966.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/88623499272.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/joxopunetufofi.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/55545291847.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/bozoba.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/4875954979.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/witanul.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/wogokurevidopidugivomaw.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/nulovajufewuvizulawuvumo.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_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 10720 bytes
SHA-256: 13f9d079702c3e6067abd9a775169101af19d871db2b53770b7739b177042bd9
font_01_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 17616 bytes
SHA-256: 7eba114419393b45faa3fa0cf0811c5a33754ff50b7191bbcb94d719d5d9615e
font_02_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1