Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc359595bf4f181…

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 08:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 21bd6dd874ce74bab6459062ebae7d68 SHA-1: a6e7b7e849c8c32a0040a1695f6f632cb8f3f18b SHA-256: ebc359595bf4f181b317a586af3ac06955e7b5ef52dae7ff66144e060d4cd262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to lure users to malicious content. The presence of external URIs and a link farm on disposable hosting indicates a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/peq6s7ol2ki6sokruihae6j8ee/lugigavoxubagagi.pdf In PDF document text
    • http://work4shop.cz/userfiles/file/55558639965.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3662696b---7555664990.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96bbd3549---betibeloxax.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0a655b23dd7c5930374500a3bfa0bd16/mimebire.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/vubizubinewuwugitawatul.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/wotuvizusajetevovironova.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7cebeb4fdd92c23fd253ac818ca07fda/17293597774.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0kl3min5nf0vngp8t2od904a7k/76008364399.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rn5rikfoeba8fmt5lvqbe0g5n1/17431031183.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sehqrnk02u9eot14ds04foqfsq/68411324578.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/55704984813.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/bajozewepadamivu.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/samezetelal.pdfIn PDF document text
    • http://cmtsport.com/pliki/74339230883.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e5a4ef4f---detuxupotudes.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/f4ikbmmus0c9qho5igh73sl53t/xuvowodavibufujodojifuzu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h019r9udf0hdn2gjdhav8kf247/podibebogasab.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/sepomizetikonager.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c569a1f78---87797651267.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/89788628299.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b248f1de964---94754078145.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/37105d9b7074d3b1d104c9554aa677e7/28665033042.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc21c490eb---78712839609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=low+dose+hrtPDF 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_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 9984 bytes
SHA-256: afa5c14730cde1593ed08c114fc88ec7591ef6344ec501ed31f924869c72818b
font_01_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 17248 bytes
SHA-256: 098a0b24faa6434567737bbc3b4845a1f28cba12bce54ab5d86c44a0d1fc484b