Malicious PDF — malware analysis report

Static analysis result for SHA-256 e761f516c697f21c…

MALICIOUS

PDF

110.9 KB Created: 2021-09-02 01:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cc24f9496a0309689756d367a4ff656 SHA-1: 5feb2f510bd2f369c9bb21e5d507c28eb91ed14e SHA-256: e761f516c697f21c68542baf25fe4f7494b872a6a3a2527830be31987efdb3a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kaupa.cz/userfiles/file/jirejawimegasa.pdf In PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210716_563C434DD672FD0F.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/gakirobadulalag.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ek92l24d283s737rp1rtallhu/febegosu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dfdf3b3f6---71719173493.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/s29p4147tfpvfnpmes4thl2lam/dojun.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/tidobekixewofajutozavixa.pdfIn PDF document text
    • https://nadamasristorante.it/file/mobizugusaxamewakira.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/52142599890.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/65334268913.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/7577698815.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/muzudorupimefavinapewekox.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/noteje.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b436d85d6---visidawuzowudupesibolusik.pdfIn PDF document text
    • http://grotech.in/userfiles/file/24969283633.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/28184577924.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kuvuwiroza.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd00ef3af7---wemiwafekun.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/dce2c320060c87dfeef07283e41c6261/dojasasakab.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f669fe56bddf90a1592ff792e70ec10a/61890803244.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/87924483428.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/jerekafamufibeta.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077585f3d342---70459496287.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nnfsa8acha1ivim2eg3u94n2qu/silas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=canadian+place+namesPDF 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_off00014918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14918 20056 bytes
SHA-256: bd6907f80f729fd3208c10c713cd9b73872f2e4eaadf6c71028032ca2a170787
font_01_sfnt_off00017de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE3 10388 bytes
SHA-256: 41473e058548153be9ff0c7d049599006fcf09e6a12fee2524c3276d66dbafa5
font_02_sfnt_off0001954d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1954D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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