Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72988667cd63c2f…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 04:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52e27a2b93cac8011b2242860d8985d9 SHA-1: a10ec69908e992e821d0679002a5e19bff8c564a SHA-256: a72988667cd63c2ff278acd1ae19181bee87b55807dc3a819fbe92d4bc148cdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/iugsdcb9b9gug8atgl76fd82cn/60133178898.pdf In PDF document text
    • http://back2wood.de/userfiles/file/dikijabiduradejisas.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/boxufutumesosaji.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/pabexuvafuzugofogekurol.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/vunupovefodukitofuzuru.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/16052995540.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/bojizabinatuvepeda.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/fonetuzekofenosipawa.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/5474573691.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/boxeles.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/xufejanilubugalusojedu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/78971534839.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/32649145637.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/11057299888.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/1431630260.pdfIn PDF document text
    • http://seamacros.com/upload/file/todolemikare.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/tetekapapakeramuwowef.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/nepaxipozinomunar.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/wofupenunebubi.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/64629444892.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8ae7cec5---55934803008.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613658d8494a4---pawuxa.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/95088071228.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/82806243864.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/kunaxutubetativapaxife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=i+ching+online+clarityPDF 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_off0000bd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD04 16800 bytes
SHA-256: 876b1ccf1c4059f0b3e9bf48068c0cdb92e6c5e4bce2eb7b7f1b003515abac19
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 10404 bytes
SHA-256: 1ad9c56c1f98bef86a175fc32c8a50a2ff6dda92b9a2912ff4bf2f26683e124f

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