Malicious PDF — malware analysis report

Static analysis result for SHA-256 040f6bf22d0b090a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 08:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a962cab9e94c5a6792e6af0936baf3d1 SHA-1: 3da1746d789c6a305646153c07f0761b18d5f503 SHA-256: 040f6bf22d0b090a826972f5abd1aee30f96f4c5ea1d0448802030b0da7e0456
196 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 to trick the user into installing a browser extension or update. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic. The document also contains numerous links to potentially compromised websites, indicating a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links suggest it may leverage JavaScript for malicious actions or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://viethanit.vn/hinhanh/file/madujixoworuzikebix.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b85971e920556d8aac919b37acaf0d5c/fesoxodubo.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/wapebevi.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/42690311831.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/15306071743.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/zinevuxigodifes.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/19205907836.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa6b8b628---kotewazukebanagaloxalulo.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/46380053755.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/43537432329.pdfIn PDF document text
    • http://markone-tools.com/upload/files/13953064434.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/22820132230.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/92885480755.pdfIn PDF document text
    • http://trevorhannant.com/sogipowimeposozadu.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/simofebiked.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/webelutufagewox.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d15ee0894f1e7d08588ae796ed84bdd1/82939718321.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/11734608644.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/87981916624.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/luregijaluj.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/86335711798.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136e782018dc---71903800842.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/54035779913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=emoji+symbols+copy+and+pastePDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/83733357697.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/gujokutube.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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 10944 bytes
SHA-256: cc8d481262ecdbdc39a24e5f56837ef41f797665ba1b806bd32514709e46be31
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 17128 bytes
SHA-256: b47ab9f861da7899c2be846e3c0cb8ec29d8b3cdafd2b40735a9d9b914eb2d83
font_02_sfnt_off00011df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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