Malicious PDF — malware analysis report

Static analysis result for SHA-256 273fa43ec6102a0c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 18:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cfe112e71ea04b750fe7f11709934b0 SHA-1: 7bc2f734464595c866d57e4e372e445315945f4f SHA-256: 273fa43ec6102a0c1f1c82cb4c6fe45f296b93f2b6efeedfb2e0b3b079dcd5f0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=saria%27s+song+tab PDF link annotation
    • http://themetamorphoseprogram.com/userfiles/file/relaruziwaxivuwupigiwos.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/38613316309.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/losugewufevodufagubar.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091417042573499.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/soxotakipifetasig.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/53233720263.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/pepabusepifojezoz.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/77d2ceeaf04951cf7b40c795983c4a5e/99839875166.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/46549577153.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/20903946674.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/mudukukezaxu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413cde69f71---26046962635.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145489acd62e---43851174947.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8ojt77njbean7paib2e2otfr84/74735355954.pdfIn PDF document text
    • https://asiapharma.la/files/files/8170175986.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/namepojepuxetarogezowesux.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/90316873987.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109095560_120664925.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/gatetelo.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/nerazamavimelaguvaxik.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/82665580589.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6cfb1de0837ec02965f2de96c2d0ee59/sanifawimopuzo.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/14357252776.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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 18104 bytes
SHA-256: e6cadef72a58b9f93cf1bcc9037f51e0b5d860824d75e46c44fed1f37adb187b
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 10352 bytes
SHA-256: 0d0475ca7762d4040370dca8ddaf64082cddce9aa006e419c08d6799f1159007

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