Malicious PDF — malware analysis report

Static analysis result for SHA-256 193aea7f3aea5f16…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 07:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c20b1260b991e5415fa1dac954e2c756 SHA-1: 5b35c8937ca982fc53ede20274fddc200cf7613c SHA-256: 193aea7f3aea5f16538962b0056377ef742722f350c2c6c3c18ccc7ae0ac44f9
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing malicious browser extensions or updates. The presence of numerous external URLs, many pointing to compromised CMS upload directories, further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern points to a social engineering attack leveraging a fake installation prompt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=pdf+file+converter+to+jpg PDF link annotation
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/31455625654.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zulapopilidawakama.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/nudabupilezixazowiwa.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/fisebevozojofe.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9b0188f1f90da8594b2151b76da6c770/rapigifiputemokisem.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ghdkpa1cp02hu58k8k11vkq8at/39288165478.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b290f60170---18137285527.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d95aa7702---96139357854.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/wuzag.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610c79cf31cb7---21722063329.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/69517848430.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/906q1g499hhg402qqac3fu5lge/nimolir.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/wikelerogenowilido.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/30482728312.pdfIn PDF document text
    • http://c-six.it/userfiles/files/kowut.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/83989545405.pdfIn PDF document text
    • http://abnicum.com/files/file/bapebologutirebowuzilix.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/166ca7da928a7eb09ce2871b9974b802/85139470909.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ntd1b5mmnnj5r223tn0kftapi0/wudumekurifutitexugixu.pdfIn PDF document text
    • http://digifast.cz/userfiles/45465842687.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c0b908312a70f8dbf564ff8866d2876c/34540305944.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/fizerujowerofeniz.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/15498424147.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/df951036d415a3b8e1255297fe316b81/ridizal.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fbed13dff99---tinekonevekamodoxe.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0297b929c7---mafalude.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_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16528 bytes
SHA-256: 41c3b039769f100f84d7a8c81aaf982712731253575ebf935fa5b6090e860ced
font_02_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 10660 bytes
SHA-256: dee1ab567883862d4ac90e807b480da646dc0c286a572a8bfb80040ff6b4b30c

Open this report in the interactive analyzer, or submit your own file for analysis.