Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cd77a7dce7737c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 23:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7c609331c8362a9e66fe66521eb8bea SHA-1: c68334584e52ee52589669d88dcfadeeaa366e87 SHA-256: 18cd77a7dce7737c65ba4e8e952cdb6615b0b584d3773f2f4dd40ca800510336
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that impersonates Office 365 to lure users into clicking a link that leads to a credential phishing page. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs are used to host the phishing page and potentially other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=smtp+settings+for+office+365+email.
  • 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://nomylo.ru/uplcv?utm_term=smtp+settings+for+office+365+email PDF link annotation
    • http://fskyok.com/uploadfile/files/sisosenigit.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/rukibuvofesototorosakele.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/83510996353.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131160b2072a---juzaxifovopunukujubem.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/tamubisigi.pdfIn PDF document text
    • https://tomas-music.com/contents/files/86894249937.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/83656010455.pdfIn PDF document text
    • https://people11people.com/uploads/File/xodenen.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210910_C5F47C7A4E9D84E6.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6c727da5---25963519106.pdfIn PDF document text
    • https://dellrein.ru/content/file/javuke.pdfIn PDF document text
    • https://lesura.net/userfiles/file/93997856404.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/20399513096.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/66988921868.pdfIn PDF document text
    • http://egitara.com/upfiles/files/fanunefit.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xadizosil.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/84267728978.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/matugikobutigufowoxoboxes.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/72433194382.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/60c69cadadf20724301c198103bbfc5e/9676379180.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/xobizupafaxuzikomesosu.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/febagekuvetovotot.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/suxosagirokanisutut.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_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 17664 bytes
SHA-256: 67a2c9e061de8d84db659a1509c8d0feab0a340d95630b50d173ffb18f6e623e
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 11372 bytes
SHA-256: 88a7782ed449572c91b3613d38f5ca2048af605e10e59fff3aadc5d9ae6c5d01

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