Malicious PDF — malware analysis report

Static analysis result for SHA-256 b902ffffdd51d57d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 20:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c716aad4cd7d7c455e8365d6a17b268 SHA-1: a64260df64ce5f2b2c1df0a797fbbf8dbc2f933f SHA-256: b902ffffdd51d57d1f515ff9941ee4b3d8352724a3749172869f6864671b3095
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=145+square+root PDF link annotation
    • http://thomas-zigon.de/images/file/33542812726.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/52731652283.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b76a7b961---fomikerafimu.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/wasimuforetiju.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/51065395096.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/78375682046.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/fiwusikalutegu.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210910135214.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f6821df8b8ea5f21cc2c602aece30180/dujopesamapisitatok.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/pukajobuxinijenovox.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/52714894901.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/zigogosafasudapiteg.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/sopiverakujemuwalefil.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/28473662844.pdfIn PDF document text
    • http://lawngo.net/fckfiles/xevavo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/78517885013.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/13378053093.pdfIn PDF document text
    • http://dfanchem.com/upload/files/mubiz.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/liburaw.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210908140028.pdfIn PDF document text
    • http://rayanchem.com/d/files/xurunalokobijomowikax.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/dezur.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146ae815da9e---purobonit.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/27644913459.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/4681240781.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fibup.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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 10272 bytes
SHA-256: dd3cb5ad403ce8d5cf47b577fc84c5f18054d8be49b57e5c83465a0ef26ead23
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 18388 bytes
SHA-256: c48afca2ea33233ceccfa72bd22276120aa7fbc2ed8aacfddaf8e73f4b5b2eef

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