Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd5436219569cbd…

MALICIOUS

PDF

94.9 KB Created: 2021-09-07 07:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23960ff718ac5c65b92ec45869259089 SHA-1: 6864e268f3114a30738eb6c554f21b4456f859c6 SHA-256: 6fd5436219569cbd7bf05df1e2956fbdf3138942f7c3274ae82f61dc6a547ae7
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and the nature of the hosting suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 5

  • 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://forexinc.ca/upload/editor/file/fufididu.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qt7qf03rp8lmbe05u44qlvb3cd/10911724307.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/c797tg6kkqmd9h8jukr9grvckj/6702212039.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/36402822906.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/sesimuwutuve.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610de53e9c616---44237046557.pdfIn PDF document text
    • https://aokman-drive.com/d/files/nubogibofusosarezodixa.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099a503c3897---34467342218.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/suxagifev.pdfIn PDF document text
    • http://stylekd.ru/files/16069798137.pdfIn PDF document text
    • https://ysh.my/userfiles/file/rezijemekasutemowasogoniz.pdfIn PDF document text
    • http://maxbrio.kr/files/files/61936328158.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/melunavibuseg.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/19179516491.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/zebisonufuxurutoxuradi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24d02825fe---79932138001.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37ebdd002---49656151999.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/38261940091.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/miwetima.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16110d47a267c1---segiwifiberagazowa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b05aaabed---52376881624.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/23161954598.pdfIn PDF document text
    • https://samowar.me/userfiles/files/jedil.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/39413752647.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/28d83df7f64d7f7bc125c0bdaad134a6/xolosororepowu.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/dalazevavalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gridconnect+firefly+manualPDF 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_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 19536 bytes
SHA-256: cb5070db289fa21b8be4b8d835871c68207a9681f26c8318d5cb6316c60de9ba
font_01_sfnt_off00013d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D65 10720 bytes
SHA-256: dac2ab181149dbe324dadb4699817be5be82f2d4625a35b37c02e247ffbe2448
font_02_sfnt_off00015608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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