Malicious PDF — malware analysis report

Static analysis result for SHA-256 237940c0e4b1d5d6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 04:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fffabf7bd17279ccb25c31f93a11167a SHA-1: 5f1d60c3ba51f4023cca9c8d201c66693b8f60f4 SHA-256: 237940c0e4b1d5d6626897598643f443a09684e1e0ca5e89684cfecc451d11c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggests a phishing or redirection campaign. The primary goal appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/61459922053.pdf In PDF document text
    • https://jgranit.pl/userfiles/file/67293575641.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/21019934452.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/bejelovudilovadesosomo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/90302215815.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/kipalilagevonibuwanuti.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5812cde6eb9cb13cae198915f9d05274/bozivin.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/21640555375.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/84060287668.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/13269901779.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/686d2faa09a6596559edb555fc830e28/wujexafarexotir.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dabejukoguper.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f367ff8564cbd4221ac08598d2143f2e/24502011741.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/91810007708.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/jarub.pdfIn PDF document text
    • http://malifer.hu/upload/file/19613655105.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128ea0aa4845---30539523298.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9b5a8adf---goxawefasoluxetid.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/94316737072.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d048a34300---jezakebaw.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/115c0ce4f1b674241ec8d31c15254acf/41935473017.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/41f81587ae76a6863d1ff81fe4bace0f/48172075192.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89667776695.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c11fcf2957eb3ea63138319f8488fece/wewurawogobemorivaxed.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/97791298091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=all+the+birds+in+the+sky+by+charlie+jane+andersPDF 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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 10804 bytes
SHA-256: 24ed27d2b80b9a8b523fd5efaeb4c80ee9e91c6d136c7d0b13ff479c81f5f21e
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 17072 bytes
SHA-256: 132124c34a4a57f867c1d84cde29600174fa8ad88483f13e42b77acadd98e279