Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b7dbc9cd1f3b54…

MALICIOUS

PDF

85.7 KB Created: 2021-08-25 16:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 161a82ddf6ab35256bac1dcaa56a3742 SHA-1: 261995e9fa00b4fd977d9ba8fb41e80b31b40b41 SHA-256: 73b7dbc9cd1f3b54b53c57e8dabfe8d22166748c946a02d4834bd7e78569cec6
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and presents a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to facilitate credential theft or malware installation. The embedded JavaScript likely plays a role in executing the malicious payload or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://albatrossmrn.com/konadnew/userfiles/file/sinilekimimawiroxo.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160976754b8782---78866814504.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/bazamanajuv.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/7682044365.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ab0e291d---75698682641.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/mebakosaxar.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hrq9m6b2aiqs01pp8csdoo6ef6/wefusikasu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fd625e3e---feluwekavisat.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/67425735483.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4ca751b3555e2bffbd1397f4b428d5ea/zutefujuwol.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d39000d330---65466489530.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/lavuriwinibusaman.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xisifukuzame.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/86532986131.pdfIn PDF document text
    • http://123dvere.sk/files/file/pakizilajijebamotoni.pdfIn PDF document text
    • http://leancenter.net/public/default/ckeditor/files/12733250141.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/5030406972.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/benejexudarugifufaleragav.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/vurevagojuruzoba.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/pidumut.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210813205447.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca0646a2c---86458561546.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/getidaranofizon.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161107db818fa1---17876940010.pdfIn PDF document text
    • https://rm-parketi.si/uploads/9904134177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+open+pdf+files+in+google+chrome+without+downloadingPDF 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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 17324 bytes
SHA-256: f80a47a1af9398dfeda28798324b592c5aac554af19fd74c0ca8820cfff60bc7
font_01_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 11244 bytes
SHA-256: 5407a9a51a6b5b1de80ece3ef4c23231539abc6edb2dfee5291f867eb7169e43

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