Malicious PDF — malware analysis report

Static analysis result for SHA-256 328d266e7ba2333a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 18:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f8a86d71ca228d7da94a851df133792 SHA-1: a3d33a26b23ee79c0d8a43879764465a22d951e2 SHA-256: 328d266e7ba2333ae15ab06bb081e9b3c46b5f265ebd0c29430acf3b8640938a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate an attempt to exploit users by directing them to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=rise+over+run+slope+worksheet PDF link annotation
    • http://aprilboya.com/userfiles/file/29970777740.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/kcnk2iap3491r90i859iqph3m6/bikuwitamoxujarexo.pdfIn PDF document text
    • http://paliukenas.lt/i/File/pivogedopufirutu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v4n3bjqgm3nn6h87vlg8jg9go3/vapomokewu.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210901152000.pdfIn PDF document text
    • https://motoralbini.it/files/file/suwavirozezizevovito.pdfIn PDF document text
    • http://roocenter.ru/upload/file/josilifumit.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/kuporuxonenid.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd3e7b47ee---70532672148.pdfIn PDF document text
    • http://poorclarescork.ie/images/16350097153.pdfIn PDF document text
    • http://www.bash.cl/media/file/jolugitozurus.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc16f5141e---lemebukumupozemutoxu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9f369d4ee---pojalatoxurure.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/4171814570.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/68996193387.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/54062014384.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/nimowonased.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/jozunesujojuko.pdfIn PDF document text
    • http://cabini.it/userfiles/files/lowuwib.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b6a70a2a9b5f55e2bbaeda1c1c4fa0b3/gosawe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/73868100915.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_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 10576 bytes
SHA-256: 543821355d2b382566353da42fb213d1e6f430d7e96567599fb5e74f8219ff78
font_01_sfnt_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 17836 bytes
SHA-256: d4925075979c467910a56e44bc75ab3f52b7d47ebb940ea1e653c2a3fc820d4c
font_02_sfnt_off0001192b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1