Malicious PDF — malware analysis report

Static analysis result for SHA-256 951899559a689487…

MALICIOUS

PDF

86.3 KB Created: 2021-07-08 05:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1bab18cd4580028ea67a0f1875400776 SHA-1: ef275a339532cde789cdd157af5dd0b5fe860d5d SHA-256: 951899559a6894877e3db216d90e0f7a69fad2d66e572ec18919253599fac022
136 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view its content. This technique is commonly used to facilitate malware installation or credential theft. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or redirector to malicious sites, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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://hanurichurch.org/ckfinder/userfiles/files/mekenojapopafe.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f23d9e67---pexowilowofoferajowatom.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7457b59c---fimenuwez.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/al0f7qqesrd1rm0avmdeku8898/zaxujipi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/10b228ef8e5b42647429ee69cc67746c/jotolufojij.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083600f622e4---32179232677.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fowur.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e03e11ac---89687811802.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/47034448892.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/ritusogowibomuwudur.pdfIn PDF document text
    • http://teplospectr.ru/images/files/37483521565.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8741b39e2---senetutadojok.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/gosalituparerozozuwov.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/fepowe.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7828b5a43180bb2c651e4338e0be6dc9/fobapurufudowoxutu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc97ee1110---14590263961.pdfIn PDF document text
    • http://usmleworkout.com/files/file/juduruwexoliwex.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/95185735943.pdfIn PDF document text
    • https://airshow-bg.com/file/pabikokome.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddb20a14b6---8118656488.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097561425195---85020904890.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/cc7907524348acbb951a7f0f14aa3cf1/wagawuvarobavatategur.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1f73e2c69fc0b130928f46054b87790c/noselopiz.pdfIn PDF document text
    • http://axwelindia.com/uploads/xuzagibozur.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/972cd5ab8d0b2675b04ee3537a5aa869/daduvorubesojoxaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=round+robin+bet+by+2%27sPDF 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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 17416 bytes
SHA-256: 57159edd5870ca51428327ed265c0d2e3546613583c240d1b575efe088064b4f
font_01_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 10588 bytes
SHA-256: 58dba154dcfda580074770d62f09c859e5de1784542a6bee8d23f61ca4e435f8
font_02_sfnt_off000133af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1