Malicious PDF — malware analysis report

Static analysis result for SHA-256 704ba50114d4b7d0…

MALICIOUS

PDF

89.8 KB Created: 2021-07-14 09:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f64b92e8a8a70356b54aef5a3d5fb442 SHA-1: 8fed8752931c4f938ea7789cd36587b6b2011e93 SHA-256: 704ba50114d4b7d055526c21d14f699c624696ad80bc7e1577af4fc1d4cd4c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external URIs and the nature of the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://synerhu.ru/uplcv?utm_term=most+beautiful+skyscrapers+in+the+world PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608690ef8a3c7---pisabedapisimusid.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/daa17a58080e35249a6a08e39dacfa62/56230089173.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/dafuvakulasofavujofapija.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6c8dc8b7---bobokawuzadudixifuda.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/87791782581.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/rekijufogamonuwisewiwat.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/47997325380.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/itfj0s0e7u26egdisj5c9mdkl5/podunozedagobowatuz.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/timudinovovilit.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/n7r7oilkk6ibvs3r1vooj4gjd2/97886604636.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ov8f6e5f48e7e5o3n7sd0vv3f5/80662472971.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/iguch1ufo6io22qbd8plbopapf/90229311660.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/demolugumanodal.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/kapawadujumutelubo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/27c12e664d7c965fe9e5af0857acecca/najowobifanimonisares.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/dufuxotafukag.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2skina1qfv1dli3kid0r5210d0/38993126024.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/a9d91ea44c05a7ca7056d8840efab036/wakivajugoku.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a04fa66dd53---lowaluzomelunago.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/21d7f0c9012fd567e8d034697861d02b/66174974422.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/9771938831.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/dea2de196b855dd35f22b36a77903d42/70283598235.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0a442ec35f7f8726f1f3910739451c55/vuvuvusegokixino.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/lajub.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_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 11244 bytes
SHA-256: b69254335a697b06af761f127938bead408185c0468f056283385293f9546203
font_01_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 17500 bytes
SHA-256: e615cd964e2d56bc04b33239c335b987d5c40cb6fd91fba0f1a2e1ea83eb5984
font_02_sfnt_off00014018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1