Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b5ba11f11136e0…

MALICIOUS

PDF

92.6 KB Created: 2021-07-08 04:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87a8bd95b7990bbaa27398e950cdb33d SHA-1: cbcc103409c4e9d0a5da88488887b30180e3417f SHA-256: f8b5ba11f11136e0b6c80504986ceab879410c98c6df2e351bb2d66be9139ffc
196 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of the PDF viewer or the user's trust to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=how+many+endings+does+nier+have PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac890162274---nilizopererit.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/69492806299.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71aac6230---92349513057.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9f4189e1---luziwipesapibisifipuro.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d38b0a23a1879778d1ec718fba984902/nemibo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609467b5e951d---fabud.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dfd500008eebc7f604c8c52dc34401a9/misutozobejemosagizi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/52797208944.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/83309958227.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/15975822828.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/fq8b2pg2p80eh76ndp1u6o1vhf/89786997244.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bced86dce74---36488035888.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf064ca4cf---bedeloluf.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c182344af75---kepilopusotiralavolerulaf.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/20955699975.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/rinuroxubanagosige.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88f82078f6---palinakorokadanuximumewip.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd006eb712---wegifowevakalojoxepip.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c9blbn6p3i28oc75uagnn3k3u1/tujajupezetiloxitetofege.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/de7a467846a38b621a6cf9b75a244956/24878467693.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5fd3087f3---66536677868.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b07084b316c---72437074315.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_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 17252 bytes
SHA-256: cc22062a73f50a00a89143b9c56f4515239a3fb4fbffc3227f9d6c61f8a540be
font_02_sfnt_off00014add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADD 10808 bytes
SHA-256: 2a9dfd5700dabdfd63333e40236fc6a57827db84eaed136958ada0846a66ce27

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