Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5db82190ade18f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 18:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b35f6d6ab66c16dd8d642f05771011e6 SHA-1: b2dea64bfec665bcbf523b909d95510af71931ae SHA-256: 1e5db82190ade18fe620f8f96d70b943831905d1acee2ee16e31f91d73ba0d4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a credential phishing attack. It impersonates the iCloud brand and directs users to a suspicious URL, likely to harvest login details. The presence of multiple external URIs and link farms on potentially compromised or disposable hosting further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://cructi.ru/uplcv?utm_term=algebra+practice+problems+worksheet.
  • 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://cructi.ru/uplcv?utm_term=algebra+practice+problems+worksheet PDF link annotation
    • https://homeuu.biz/upload/ckeditor/pages//files/gomonejarezoroz.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/74436275057.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/24357373101.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/vupibemamisuv.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nadipinisazajutawesu.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/gazubo.pdfIn PDF document text
    • http://mebco.ru/images/file/jizimalomilebab.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/27930958539.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cd07bb4f0---fugoku.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/40482690321.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/0afa71d156f385cd293891f88abee2a6/57094304120.pdfIn PDF document text
    • http://palcev.ru/userfiles/file/58811250159.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/bejobu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/663acbc7e4bc91f2aca4c54a6ee9fc5c/85754298789.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f89e1e24d---42150145440.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/wikomejovikamevilefopolam.pdfIn PDF document text
    • http://topp.pl/_topp/file/kerusu.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/rulifubolifamijozunexebe.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/a50396e6de7988d5b8b3f367a51c33c0/96780839846.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/vefinenizadejudofakuj.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ff97d6dcceaf84b76bc84f1c7b1980b9/rejopi.pdfIn PDF document text
    • https://vpmemorial.net/images/file/taseposafutanij.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_off0000cd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 16856 bytes
SHA-256: cf20618cd3519511de73680fff5a65b23b865da8b48eb69b856346e41d31607d
font_01_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 11016 bytes
SHA-256: b488b89d5f01012730e59f82dad9ec5c949ff4880a1b12a2b2e12fa7ac4e4bf1
font_02_sfnt_off000112ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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