Malicious PDF — malware analysis report

Static analysis result for SHA-256 9429cc4170888607…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 00:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 526bfc3766914644a03bde27e294c435 SHA-1: d3e069ebabad78f6fa4ffde9b2f04e6340db05b7 SHA-256: 9429cc41708886078e1a34adb341271949368c8e291335129daceb5cbbe9f7ac
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload storage. The 'Browser extension / update installation lure' heuristic indicates a social-engineering attempt to trick the user into installing malicious software. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • 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.
  • 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 http://biometria.pl/photos_fck/file/37481997895.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/remazogusibanip.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/54220847572.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/sejapufeg.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/vagawijowedukonivoziko.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/mamasinenas.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/83459446617.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/87679199123.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/duboxofobiputuvopig.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/gofisaparigolisepiwuked.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/bajupadalevefuwaxejuf.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b21cd9edb0de276522dbcd1132dc2b5b/78000645130.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/32857494091.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/89634390951.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/pimidedogiwobej.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c719967652---15561864924.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e515c300---9055870526.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/busawe.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///mivelug.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210903203236.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/42087683368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dark+theme+app+for+androidPDF 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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 10644 bytes
SHA-256: d271b73f3b92ca07ad46d47d1f9eeba12eb9ad20433cd0a3839eb7be315ebe1f
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 18012 bytes
SHA-256: 70e4d92ca94a732019622c21e9a00a6a2401fc9a27bf3052d7509adb963685bc

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