Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab5d307dae53f74…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 01:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb26f44d5a7138077cc4a9d7f9f06cea SHA-1: 8a994091a90170b1ba1d46e6dca326ccf4fbe645 SHA-256: eab5d307dae53f746bbe22dafd3c695375bd872b7e2019d41a58759941fc6507
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or engage in phishing, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mgc.to/sites/web/upload/files/105204689.pdf In PDF document text
    • http://svaz-podnikani.cz/files/file/nowanidonezidebuwas.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/21857319051.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/pusexawufuvulelabadijotut.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/vupigenobolexov.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/bodipu.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/diredafoz.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141ca2f6d813---zoxilatokavamoxotuw.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/nofejogol.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gozotamazofumogexet.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/derosufag.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/nuxuwakofivofix.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd90229096---50448903414.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/femekatibunefuda.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/59186055025.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/sizaloxekufawusumemepete.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143da5026ea5---fuxuwilusasanexajiba.pdfIn PDF document text
    • http://szjg.hu/images/file/wepomefutasupej.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/12917656587.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/27896949600.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/12530886046.pdfIn PDF document text
    • http://kvrhousing.com/uploads/dunatajuwovaranejinalizej.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/sonuka.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/60153049077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+i+lay+a+fridge+down+to+transportPDF 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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 10904 bytes
SHA-256: cb6bc3ded7332575630d4cb262baf16e40f1b346bf8b54b5c6d6cb82798e5d02
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 17940 bytes
SHA-256: 3fdc5af643947dd7789cb06725523b8f15d54094e4365b2725adf53ef1214688

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