Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf7cc9e3565eadd…

MALICIOUS

PDF

118.4 KB Created: 2021-08-17 12:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f624d5e74643d8af7ce66ffce4c98e4f SHA-1: 95a69508d93137bd653075d84ffe16479ceb9841 SHA-256: daf7cc9e3565eadd2bc57696ec32e17bbdaa11c22b9002a9d87eb9214262882c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4149a603---muzazem.pdf In PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782835a3796---3840385915.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839e7d1d2e8---jejeluwu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/78334083598.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4142b283---jamalazisanupuxog.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed4f8bce3bc854354729e568cf0dc5a7/fanitikexuxoxogo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/mpsgv0bjt7mbdll95vutj9rs13/96521843033.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/sinekonefudanoramomosa.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430131301990296.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/badavebuzupa.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9m52a0po97befbrkc8c0a5jn6q/xokenejozedujisinafezuw.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/70298381003.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/48938257368.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608400b1ec97b---dokakapikinarofotibebivu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/cvn544j4a63glcf9ju8saguoja/wazasi.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160912b8fe7de6---12877273150.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/65474003710.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5e1dds9vn0j5v2so475vb7t0mp/xaduru.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/60065343160.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/745213066921627996364.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/45960616732.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210806184341369949uh22no.pdfIn PDF document text
    • https://linoforti.it/file/nilexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=is+the+medical+assistant+certification+test+hardPDF 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_off00016b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B89 17332 bytes
SHA-256: f93daf2d741a36519db32ca4e23d050eca5ff936c3fd713ce8db42016ece1743
font_01_sfnt_off000198e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0FE 10692 bytes
SHA-256: 0960c4ac18c8a81e7d94a851cf1b851f2ced75ae22a8539251d2a601244a22b0