Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bff60c772143ffe…

MALICIOUS

PDF

87.9 KB Created: 2021-08-01 08:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68d576e9b620cc64518d7d7e9af9cff8 SHA-1: 483c52e63d99d302cada48db3abe4caefce4bb81 SHA-256: 8bff60c772143ffe1a349feef376d36edf077bf3c74a3e31e0fcb3053ca972c6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=how+multiple+effect+evaporator+works PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711d3c1d3da---fojokalizowajonuxazu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/f3honr55adani4dvq087jklenq/90457881163.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/joxipukagatusup.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/gerumolimewizizobawes.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/genivutemumepojodi.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/8895654620.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/22874468684.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/99852734139.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/4ir0s9h63i4god34b4hsn2p8i2/57548620851.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/nefasosubotukaxufub.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7484e3cd55---74837931989.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a96164911c3---xobosaxaxag.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/24060537426.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/94580240612.pdfIn PDF document text
    • http://centronegozi.com/public/53201547670.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/dakulimefodilapobejijab.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/jizepowogejunafamito.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zegibaf.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b93fe46ed---zunonisegudajidixev.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c56664d83---83588323413.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ad3646e63f84bde7a2028e3326589990/83443957086.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/59583413642.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/vuvebaxusidodumud.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/14479373581.pdfIn PDF document text
    • 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_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 16596 bytes
SHA-256: 2ff02b6629517533d3d8d8b10e3be776fd7db4fbbc0a2bcd1df7f20d2f09382e
font_02_sfnt_off00013870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13870 10872 bytes
SHA-256: bc57d0edaf7cb2492bf1ee901b19e79f6e1cb2786ef43bbc280a029a33151e3c

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