Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca53a8bdab029cbe…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 08:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb8dbaacb291d9ac2ba6d5218d641dea SHA-1: 97fcc022b9e468157bf28e74e503c8466db5968f SHA-256: ca53a8bdab029cbe8b71b38f9b4021c772a41e2c7ea0a05f715e2049afbb7cb4
176 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. Heuristics indicate it contains a link farm pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/be90bb56891e307f09a41e5ca6469f4f/kurexa.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703745e8181---forevovijisun.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/14175523413.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1qofp6qmd237ltf4jj34bo8637/58874675215.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3352f69337---32405823435.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/rarivawonoxuwazu.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/jujunutewisarijezunenizuz.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/moxubetisorajikaruniru.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/fjnkbmj0r2i3nbhih1bgvochg0/kivafofinuzivubonu.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/jesibegorapufage.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/bajonabupurenabinosaruj.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073941eacea1---semegiferutal.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/73931229835.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/kusumajepipidulogox.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/denotox.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/sozoxubosaronoralatuduwa.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/liseromijafakajada.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c9e61e79a9c37f9f8b62cb688da277e2/92876914581.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/fasanosew.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e60b98aa66132c05248f0013dc7846ee/jetorosaridimamageriv.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/71245702131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=xodo+pdf+reader+and+editor+for+windowsPDF 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://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_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 10536 bytes
SHA-256: 3152c49749829a95f4ba73d259021af3f91e98122274a4cf26ca19aa9dc7121c
font_02_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 17484 bytes
SHA-256: 21eafb3d39049e205f99a65236988bd494e979bf0ce6e80f7b9d1ca944ab4e33

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