Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b910957e4ef731a…

MALICIOUS

PDF

90.5 KB Created: 2021-07-06 15:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1654109db23fcf20e70b3f8aed3874c1 SHA-1: 8dcb4844f6b8686602f2dad4e5e4b21be2f13327 SHA-256: 4b910957e4ef731a3f6432f968f2d4eff84664ef31b54e65e50643a76a7f530b
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely attempts to trick the user into installing malicious software by impersonating a necessary update or extension. While no scripts were directly extracted, the presence of numerous links to compromised CMS upload directories suggests a pattern of hosting malicious payloads on potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be64e3f0d21---49815837453.pdf In PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/fc3a5da7499d66da0ab40282c436063f/wojaniwimewotizob.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a189cf148---42472991445.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbae8d6356---88150042405.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f9d842bd---3043645783.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ded57eea0023fc3824d0de857b38d24d/xifob.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512114332663053.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f64f892e1f---73196497508.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/20649862385.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/jevasedonoxopenekuriji.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/r5rmv1jhsdrjavbu82vobrfu40/61387886115.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/daxezozuwosudogudavefud.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/25542807681.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f52a2ed246---rusalujitamidosewezaw.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ab896512681---volalom.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f16abdb48d---gafedomumulonowegubosu.pdfIn PDF document text
    • http://berbun.com/user_img/file/33569409658.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6c91e5560bbd98ec0d49db131ac9fc52/pumepudibedapobutetex.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/buxopad.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ea4f14edd3339c969452e62bf605a931/lopawuxiditiraturat.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/13881511736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wind+weather+today+at+my+locationPDF 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_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 17844 bytes
SHA-256: 7efe8b7857f52910158ebfe8788bfdb8feab0cb0d16a907741bb90a6c73cdb3e
font_02_sfnt_off000144c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C0 10660 bytes
SHA-256: 9c87c1a63e5e830b8680d5799b2320cadded5f518a1b9f4c2a3cc88bd07af15e

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