Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77b3234187dc1e9…

MALICIOUS

PDF

126.6 KB Created: 2021-09-07 05:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff8dbdd2668e7933ca25dc34b4cc0b20 SHA-1: ae75ae231520566e0139da6c5e15639c0d0f404e SHA-256: a77b3234187dc1e9c30c43e9d9568353f3d37faf40394dd2bba0fad5a6f224d1
252 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The document employs social engineering lures, specifically a 'Browser extension / update installation lure' and a 'Visual download / call-to-action button lure', to trick users into executing malicious content. The presence of embedded JavaScript, combined with the overall structure and heuristic firings, suggests an attempt to download and execute a second-stage payload, likely exploiting the user's trust through deceptive prompts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2621a9fd---7944682705.pdf In PDF document text
    • http://otvorene-srdce.sk/userfiles/file/wifemel.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d710f308a3---mowed.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/36871418040.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/nuvupekepuzijebiwo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a938286da---mijaju.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/97425664280.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160776221830c5---7864219980.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/jeromu.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/89185699125.pdfIn PDF document text
    • http://4bx.pl/public/file/janumisebapuv.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/85404260692.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/16190767395.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/nasil.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f74f7b7be99---74195196517.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/b8r3ussn4n7vfcem7nrafcdqhe/68458776974.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/66929871926.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/2513941610.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9ef68fa5a---bemizibukife.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2138b20ada---femuxibumisanepi.pdfIn PDF document text
    • https://digireg.nu/upload/77743131766.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe3f9704dc---kutubamorabaro.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/24699942350.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/lalefosatamomiwafazib.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/23b1ad1b108ac2f42ed6bbfe666740aa/42175697731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=js+cheat+sheet+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A35B 10248 bytes
SHA-256: 0ed012553def36ab2cfee25c6aac9568450dc6b56c844f59480ec7e872d99595
font_02_sfnt_off0001ba88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA88 19108 bytes
SHA-256: 5fa6b1544547996dd1e9edb76874a04d9da97781d79318110d935c124c50fd87

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