Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bc86f7142cc5eb…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 10:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e583f9d62f04aa622bbf80a06a8a6310 SHA-1: 1b3cd3f2669615cda845a75b6d24f954ddb9a238 SHA-256: e9bc86f7142cc5eb69e5effeb9391e1ead8fdc8f97f031450ae5c0903099b4e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nhagiatxanh.com/public/default/ckeditor/files/50631636718.pdf In PDF document text
    • http://gloteckr.com/upload/editor/file/tumepubitaxibogikoxavex.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613598f92bbd4---65244169946.pdfIn PDF document text
    • http://ipceurope.com/assets/file/vufaxazepa.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/jesugodedusagil.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/47931701398.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7267b16cc---dozajutadovi.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/wekewodezisesorodebusu.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/xopeveferulilegigawiti.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/xevug.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/sukulotise.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/73333488241.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/masubafuvirotamid.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/12714069912.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93739678384.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613554dc850ea---fafujewedewiwupo.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/76689530181.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/rarukulurizoragubal.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/6175632506.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/36214704732.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/54187591527.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/xotenajedorogilonagiduto.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/xipifisijizulenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=drive+for+speed+simulator+mod+apkPDF 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_off0000b406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB406 10816 bytes
SHA-256: d15374685b1d1d0d99e9bca9d6405e6aaa024ac6687f623674225c894a34be7f
font_01_sfnt_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 16600 bytes
SHA-256: bcca66226beabc9c5a22f70c0c3f4efd60116e2520acac1eccb04aff6ca440d1