Malicious PDF — malware analysis report

Static analysis result for SHA-256 978f3e77af1d7d2d…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 06:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b526240cac07f12d67b26aab74291f0 SHA-1: 46cc51685d0dc514bf52b8cb1c9b80f9a744dffe SHA-256: 978f3e77af1d7d2d6858603a8ca45b9d73a99add8081e00868b7ddf41f273eec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to drive traffic or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=fury+survivor+pixel+z+mod+apk+unlimited+money PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b04465e59---16411664245.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/58018723832.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202191154453.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/21302937377.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/62273236838.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613913f0cc492---surezozubinimawumorov.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/12352639527.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/88431722356.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/zewigab.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/82031143512.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210921_A1804DFD98AED3A9.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/22972308154.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614934082b9cd---36476733251.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/88029205378.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149075f1c79e---vorovizebapotumafo.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210904013317_89xz5j.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/chculb0g4nshqu9ni73cqu03pr/53304265852.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210912035216.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440d73dd775---43961367239.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/wejugejili.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134054eb83c5---67179286076.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/72630741516.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_off0000c42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42C 11064 bytes
SHA-256: b423c37833688b7a2a06b408ca02d4ebf35d0ba314920b9230b8e7a15bfcb345
font_01_sfnt_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 17836 bytes
SHA-256: 3730ce6c7c89c7e67ed40af935ab93d21ec8a3a743efeb331752785ab2702200

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