Malicious PDF — malware analysis report

Static analysis result for SHA-256 9056ee7c1a7e0193…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 13:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df6c26106529cc90549967f182a7f43c SHA-1: 503e723344bd663c52606a86ccdd8de98f69218a SHA-256: 9056ee7c1a7e0193ec47482657ba03503014a190332bd9f5af302bff5b11d148
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the link farm nature, suggesting an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://coretry.ru/uplcv?utm_term=addition+and+subtraction+using+number+line+worksheets PDF link annotation
    • http://xinshifm.com/userfiles/file/lizutina.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/30218921189.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/22961219390.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/k9upb08282nbd61vp8897393re/3651756802.pdfIn PDF document text
    • https://negaratoto.com/contents/files/jazebadataxizelizasowukag.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/kabedametevadugudavezen.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be897ea77f8---mozazoxotaxemovej.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210719/file/16879748594.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd17b1a7efa---zakad.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/nagurukazok.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210725094055.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e4ea0ce60087004c16b6202cf9f70a5/8120817420.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3g4g9v7p883g4quuv3d0qppg07/taniz.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/vulutefo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8873be4ba---24639624838.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/fanosatomul.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/83027147787.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/97653699022.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/buvowelagofexuv.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/969c74d2755a9fbd108f710f20046162/xinizugasatorerukenulanap.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/xovovo.pdfIn PDF document text
    • http://yoron.net/up/files/pezer.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wagasusovatemuvimeduroz.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/xumasapopodiravof.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/813eaa08f76b77d7f750715961735646/46514512369.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce639caf69---86115372536.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/tanuviru.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_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 17472 bytes
SHA-256: cf323201e028bfee3e4fa20b2fdce288994f845783560e204591472d11418b46
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 11216 bytes
SHA-256: f656132535cec99117799be70c791b5cfaac17c665b77a64462365f0900b543e
font_02_sfnt_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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