Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28eeaa498c41470…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 22:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c977e364d530707312881be39a99902e SHA-1: 6a3de061aa62262740ed5fa98a69ff082074a6d8 SHA-256: e28eeaa498c41470d48dde64dc85d4b1c7d1987df5997552fb196995e13c8de3
196 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it's a link farm and a lure for remote-support tools, suggesting an attempt to gain unauthorized access. The embedded URLs, while some are marked benign, point to a pattern of hosting malicious content on compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/kitav.pdf In PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109160425518530.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/rexewamoj.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f60f26685---bimanelodakewaroxi.pdfIn PDF document text
    • http://szwygs.com/upload/rezafavedixosisipeto.pdfIn PDF document text
    • http://poiskvod.ru/images/file/56523170882.pdfIn PDF document text
    • http://bronia.org/userfiles/file/juraraz.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/31546087710.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/tegakovolasojozipi.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/tajawuzivirero.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/23999758152.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/vakuxivesas.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/56734964607.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/24888964033.pdfIn PDF document text
    • http://sin-hua.org/userfiles/sewikepixizaminadu.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/55647693275.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614504492eb05---54100771971.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/68584505935.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/nafane.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146657e3b5ce---9418150961.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/gonelipoligipogakejo.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109130723476773.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/25758863992.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210917_1E44FB7275C68D07.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/41518169337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mobile+legends+bang+bang+pcPDF 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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 17444 bytes
SHA-256: bd465c53156e0a1af9ba8969f04302231e009e5594811444cbfa8938f9368c92
font_01_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 10624 bytes
SHA-256: d7bcda53cc77b6e13a97cb55281b936050b008de6de490769cf8823a69afb704

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