Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f37d5d1c1d3c77…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 02:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5313d87c1c98ed1d44b1aacd6e068b6 SHA-1: 63a125d53cc8c579f7398567564e30c2473c77e3 SHA-256: e9f37d5d1c1d3c7733b5ffc9948e295dbfec619f3234e56676ffbbfbf4771c98
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials or session tokens by mimicking an MFA or one-time code confirmation. The presence of numerous links to compromised WordPress sites and disposable hosting further supports a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://changjiujz.com/uploads/files/202109140921316721.pdf In PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisunavosubudoxokodi.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/42970139506.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b2bc55e7---terisaviwenodop.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/diruk.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/556315692.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/66358442497.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/datofatebefanabowafi.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/wexuxi.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/nebawo.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/keduwujupuvafigi.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/lamamipetufujejuboda.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/wapikigoraf.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/6787343234.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/97c74c89aba58ad2ab87e66efaec516e/18163335537.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614270a352a76---27225747440.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/vapajobabik.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/dibuxijebazedodozomisep.pdfIn PDF document text
    • http://boldogelet.hu/media/noratebalu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a4350026f5f9ec46f97b7eb8e8bc87a2/jaxaxiwifixowogapewo.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/ludutoxuxawitob.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/wubofomuzajatutur.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/42456448205.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/96646501795.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/73262688964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=duo+fortnite+deathrunPDF 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_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 10340 bytes
SHA-256: 9ffde628f95c5a1cabc76afe7a5afdfcf9c1d2a83c9be3874e61f7a045f5bd48
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 19212 bytes
SHA-256: 2d8413f9aeb60af58e35b09fc6a5455e3eb5f84512e934a6f03c502697ad7dff

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