Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ad22d1e100fd0d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 08:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da6494946f9025956c0438276438c28a SHA-1: 1a3218e072a000d30a0b5bb4a790da2ae25291d8 SHA-256: a6ad22d1e100fd0da3d6ff60a41fa1c0772faade37f5ac49ae85417b35837f52
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The embedded JavaScript likely serves to redirect users to these external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098376624f61---figebugi.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0b89a28b---xukuj.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/65963063619.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/manowide.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccaa99a82---68324052614.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/zilip.pdfIn PDF document text
    • http://soc-in.com/data/media/files/peloviw.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/84614571925.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3f55de9eafecdc02b6014dcacb1eeace/15653484774.pdfIn PDF document text
    • http://billsky.ee/files/file/15495435099.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/3e53915cec21c80dfc073f73ae58dac8/kazumesasutifuwopozivobad.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/bonajuragixapelegitub.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/77603003651.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4972d5c2a2289ebeeabf3fc163f450d4/janubifokulevodagade.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/jirunuz.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67a62617bd---60386455253.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/giwodoxu.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/85440228076.pdfIn PDF document text
    • https://polytex.de/sites/default/files/75270537877.pdfIn PDF document text
    • http://planetamama.ru/files/file/7188020874.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/zuvepuxajesorodum.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/tujasud.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/36716374947.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/diwujesewukot.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/mefuvenirixepupesolab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dell+precision+m4800+laptop+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_off0000bd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 11044 bytes
SHA-256: 65d8cfde4d65cf89334bac77a1fde4c13141bc10a914b097d54dab5e8c27546e
font_02_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 16656 bytes
SHA-256: 8c5be1a88bd10902e28a7ed7baeca82ec635524a4b806492e05a963ac5c5364e

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