Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a379727869305db…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 00:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6ad8da1c2a1b0b14d4d60d79690c0d1 SHA-1: 82ded5dcb4bb77226938b863ac0f7c73c3fa7c01 SHA-256: 8a379727869305db0d3fff0b144098f403b9157e5e4b079c5287229a60add4ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a lure for credential harvesting or MFA abuse, directing users to external links. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the 'ML_NYX_PDF_MALICIOUS' and 'SE_MFA_LURE' firings strongly suggest the document's purpose is to trick users into providing sensitive information or approving fraudulent authentication requests.

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://www.civilhospitalpalampur.in/img/uploads/files/sukow.pdf In PDF document text
    • http://ntvietnga.com/upload/files/muwifuxozifejiz.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/20897488331.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/24669996809.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/rikepeposiruxubafi.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/42172292647.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/mewekolaberejomeso.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/jusebeti.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/xixuvaresololef.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6ac5524b---18141464277.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/vigixe.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/18446857686140575082eec.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/6899390754.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/ruvix.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/rabokelid.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/zarurunatobukawav.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/rawukudomulox.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/gedirinugovobopidivizafe.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf64e17d7---kusuripixitigiro.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1e39e7f976c5d987451a2ecc6e6094ab/46733559429.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/lowefapuzujesewuwi.pdfIn PDF document text
    • http://protezas.lt/i/File/zunasizefafasasetodo.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/93980795042.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/14286423921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=install+imo+app+downloadPDF 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_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 10360 bytes
SHA-256: 61b79615a853cec6c3250d09c74e4431020a6bf789bd095b3b8d71657a9a44e9
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 18564 bytes
SHA-256: b1f12e20f09d4c2303723f03d2570ee5261e871da280e6091bb716c8ce1d3baf
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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