Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4c59778f52fa8f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 20:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ad9ece6ecbc5ac5f9a9d95ef4597954 SHA-1: 20513a523caa402bc0ba69a81666b8a31f52ebce SHA-256: 5f4c59778f52fa8f2e553f41fd0c6400f1dab786db9f0f4ef3fc5a51410cc93e
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 URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly indicates a social engineering tactic to trick the user into installing malicious software disguised as a browser update or extension. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=sonic+scene+creator+v3 PDF link annotation
    • http://pazzo.jp/js/upload/files/rederuput.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/32712746055.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/40829626045.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/98821084848.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/82416625336.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/45564323476.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/felesimowegujeleketuxes.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/19424386306134f0c2d938a.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8a521fes81b62ufednm2qhvcb2/jupifuvutoma.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/tuxewosejimozedaf.pdfIn PDF document text
    • http://orderkai.com/uploads/files/pelamuwiduwe.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/36395591714.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ba5add8---jujulagudupekajomudem.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/pevukidefafax.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108312012145014.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/15819245091.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/52006714054.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/pukuvisarovenumubujadusok.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/8318363406.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6ebe6105db9ac4b87983589d06c3d919/fokuvofariru.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/jonukap.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/tenigerowagox.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/bojumogiwixemitugutanino.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/dasano.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/letefavupe.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/76415679906.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_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 10492 bytes
SHA-256: 113a4de180e07c11bbdcd111d0be0053e0e948ef69a39621e6ba3af9ae189122
font_02_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 17152 bytes
SHA-256: 6a38f55b4ea6ce698279dfd449c16b34575f0753d0847640368e196b7997ead0

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