Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8d552bfaa1b8bb…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 20:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0caf38e12889e6cb828af996eadf2d1 SHA-1: 49d24896ad9daf256282a14620c4e8e51f75666c SHA-256: fb8d552bfaa1b8bb59e472b88312fb787b1dc239998e0159e38791dd608b1230
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a large number of external URLs, many pointing to compromised WordPress upload directories or disposable hosting. The heuristic firings indicate this is a link farm designed to distribute malicious content, likely a phishing lure disguised as lecture notes. The embedded JavaScript is likely responsible for initiating the download or redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=distributed+operating+systems+lecture+notes+pdf PDF link annotation
    • http://kenshopvn.com/uploads/files/70261563301.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608c885637efb---walumewa.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/98492877917.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/tiselalozuj.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1a835676e---tunaki.pdfIn PDF document text
    • http://bjallstar.com/upload/file/46651906683.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/nomelawazaxano.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094824984ce3---lurupid.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0f64eb504c9cb91f1b4dc1334abca004/golubopesasutas.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/45980505073.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/hekjgto0k6n41r6g8rattkg3j4/pulewopivilavedelosamed.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/lefufuranoliluz.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/33579661.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c1d30ca7764b8874d6273952981f4c1b/megivitawowiletesidunega.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/filugozaxukinolewososa.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dedoxapus.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tprbvppdrfo19vjtol1durku8s/3467498165.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/84179899023.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/15952835992.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///likafuvezofidekibokome.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/wolaweped.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/16074583053.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bad710be13f---62232486176.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/103de077642242db0e674f3a2f7fdd3a/89567153116.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_off0000ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 11316 bytes
SHA-256: b41785ddf0296adaa4afe251f20bab6fbe255ef06d0c2feeed734214b528f052
font_02_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 15168 bytes
SHA-256: 819d7434e7cb6395ff3ffcda4e14bce0811f7984f14b441b697d47d90efa7149

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