Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e8a9688f461126…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 20:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c9e81ef1a4a6db6aa94b42d993f5538 SHA-1: 08aa4e1520de3c40007432dd71e1d59469fca733 SHA-256: f4e8a9688f4611269e7d76e04fc34cc8ca9174886b79c38267b08d740985b4d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and by a ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://onecre.com/images/content/files/9200034537.pdf In PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614195c47e16e---mipigisukenopuv.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109170944001900.pdfIn PDF document text
    • http://yuli-china.ru/d/files/galeritewisiwufomopolebal.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/tuwofolavofi.pdfIn PDF document text
    • https://reha.bg/content/upload/file/55251454760.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/4716424978.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/n2ktcphtv2gip670pu1bmiqvii/borofowetegetudu.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/wanepejilokazotiposino.pdfIn PDF document text
    • http://chicopharm.com/upload/files/xabofurekadigiraxufit.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319aae6d287---gukurudazapava.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/vopotituropumota.pdfIn PDF document text
    • http://dasbluemchen.com/35680322967.pdfIn PDF document text
    • http://marymo.ru/uploads/files/54065517069.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/nebudobinusojuvubiwixep.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/jikib.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/dujeresazapewu.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/52020296121.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/soxuxokopizevebon.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/jaxewan.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/lujikibewebukeluwovowuli.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f66f9731b7---joweketikivinijew.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/fuzokebololumepivesome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=passive+present+continuous+exercises+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_off0000d1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 17972 bytes
SHA-256: cbe4f1941909b96f10ab9e040f24e92af7c5c928452bc606e2f277a009155b90
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 10836 bytes
SHA-256: 678e4842f090a96700c938d22eb7bc2c1d110f87a2ee43c6c2c847fc3d7e6bf1
font_02_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.