Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92722e7b175e287…

MALICIOUS

PDF

71.7 KB Created: 2021-06-22 21:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2e31d6601953e7956b72e4bd83fe432f SHA-1: b8a243ff0fdb3a658279f2ddd6be352d9b952187 SHA-256: f92722e7b175e287af40b3cfb5f9b026ec772d8d09c0c1f4f1ca0632e576cc26
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that uses a cloud document lure to trick users into clicking embedded links. The ML classifier strongly indicates maliciousness. The embedded links point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1a6423a490a753b51fa55a0064ac3f74/zidaxewigusenoni.pdf In PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0e6c6aea---66631806896.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/94706484015.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/7816133368.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f91f200e9---52988887639.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608069d808d69---tetivo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/59489782168.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/gd7tt0uvo9h0cbe4urt6gioq7h/junar.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/39cbe9edf389b4cb961a2777cd0d56e0/17529668375.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b43217614---pesatekufilurew.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085277838aa7---zexebawapejilas.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84a006c23---tadukataxa.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5e0c68839af2dc2367aa9cf2b878853e/buvelomuguxitaxazaxef.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21126c7b6a---55985528219.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/tagagiguvab.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b4b9a638---56465805758.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8fc64aaed---munudokixotexepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+to+ppt+no+limitPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 4704 bytes
SHA-256: 2193173abc9857694707ec7eef7fae5be1c9c5d29628a91022891488a5030d0c
font_01_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 10804 bytes
SHA-256: 4214f1de9d9b36f225b128368e5502ba40639f6b86fe7da35118677e170cbf83

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