Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c00e3ffc63b3470…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 12:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 340e42154f8350c1a40cb7b0a3007625 SHA-1: 859d96571fbd657549e11595eb331841d9e28ec1 SHA-256: 3c00e3ffc63b3470c0c7a4d25e02b730f38df5a39735aa950bcb85eccc66fb3f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sherwoodchambergolf.com/ckfinder/userfiles/files/22853350930.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075e54459f---62154417203.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db6d08bc8e---dubusumozeze.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/netewote.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/89947526556.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/57434496742.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161145719c0d06---39117677829.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/fabif.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/tupatenew.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbbfe1213e---fekawuxopaxevuxobuwifagun.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/narezi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b431ad4bab050dce9e4264515b027a02/50837926657.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1dkn0098m09d2i3sap665njor5/wowevujukalem.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/25813401594.pdfIn PDF document text
    • http://ge-mak.com/files/67983337296.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/mubudurudulabusugodiv.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/4393392423.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/83956455378.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae24562f4d---17584376325.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/xosolibusogasaw.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/25376547862.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/vulinebotewebinilup.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac8cf3f8f---sobawumisovotidazamufapi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16105a9d667393---64268765401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=critical+care+emergency+medicine+second+edition+pdfPDF 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_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 11108 bytes
SHA-256: 209a2489563bb188d90235a6571b0e3e9a485a34144bc1ecccfa573db8379195
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 17820 bytes
SHA-256: 2862b6ce5de5a01e5431dc66296212a1b8add6b0b0fecb2fa643c8ac9bd0d1fa

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