Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5c22ec1f356dc9…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 19:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6082b7f428fe67f009ef8aaa833b7814 SHA-1: 00222a137a16eeceed12765bc7e7b9523868015b SHA-256: ea5c22ec1f356dc943fdebe6c0e254a11f73352a41e715a90af7161c96761dc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for potentially malicious purposes, such as phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to a phishing or trojan delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=talking+tom+camp+apk+download PDF link annotation
    • http://lnv-cnc.com/userfiles/file/44282982096.pdfIn PDF document text
    • http://theponghop.com/upload/files/33406153953.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/xazilowimifepixatalina.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/11500222080.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/vixosukimasiwavazeweni.pdfIn PDF document text
    • http://preiss.at/upload_files/files/36057020423.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/gefofegeduruja.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/96324668290.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210916032211741574097.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/zuxaluxavuse.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/6844398887.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bae1ec25a4e0dd3c4998f7da99c5d9c2/2434515680.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210913/file/50564535955.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613246d6a7d81---33388991674.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/nutobuvonamugep.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/rasugusoxesetoneridapo.pdfIn PDF document text
    • https://il-gusto.com/images/file/53089872573.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/64001006654.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/pefujesixibux.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/pivimuz.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/25443858924.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/77234956592.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/25807925459.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/nemudupudozi.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191244796573.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/90bbe377f6debc66ea04e2f50a7e93ab/nununurifaxivaji.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_off0000c329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC329 10600 bytes
SHA-256: c96560b1ccfe6757868c0713772f4898a7cba91390e34666b031bdf0df82c698
font_01_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 17144 bytes
SHA-256: 897d7b2a38dcaa48ad802914fd8708bcd837530c9f88ee0ad4a951a82570df8b

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